diff --git a/plinth/__main__.py b/plinth/__main__.py
index 37e62ea4b..6b463d272 100644
--- a/plinth/__main__.py
+++ b/plinth/__main__.py
@@ -33,6 +33,7 @@ from cherrypy.process.plugins import Daemonizer
 from plinth import cfg
 from plinth import module_loader
 from plinth import service
+from plinth import setup
 
 logger = logging.getLogger(__name__)
 
@@ -57,6 +58,9 @@ def parse_arguments():
     parser.add_argument(
         '--no-daemon', action='store_true', default=cfg.no_daemon,
         help='do not start as a daemon')
+    parser.add_argument(
+        '--setup', action='store_true', default=False,
+        help='run setup tasks on all essential modules and exit')
     parser.add_argument(
         '--diagnose', action='store_true', default=False,
         help='run diagnostic tests and exit')
@@ -132,9 +136,7 @@ def setup_server():
     cherrypy.tree.mount(None, manual_url, config)
     logger.debug('Serving manual images %s on %s', manual_dir, manual_url)
 
-    for module_import_path in module_loader.loaded_modules:
-        module = importlib.import_module(module_import_path)
-        module_name = module_import_path.split('.')[-1]
+    for module_name, module in module_loader.loaded_modules.items():
         module_path = os.path.dirname(module.__file__)
         static_dir = os.path.join(module_path, 'static')
         if not os.path.isdir(static_dir):
@@ -258,6 +260,7 @@ def configure_django():
             'django.middleware.clickjacking.XFrameOptionsMiddleware',
             'stronghold.middleware.LoginRequiredMiddleware',
             'plinth.modules.first_boot.middleware.FirstBootMiddleware',
+            'plinth.middleware.SetupMiddleware',
         ),
         ROOT_URLCONF='plinth.urls',
         SECURE_PROXY_SSL_HEADER=secure_proxy_ssl_header,
@@ -278,6 +281,18 @@ def configure_django():
     os.chmod(cfg.store_file, stat.S_IRUSR | stat.S_IWUSR | stat.S_IRGRP)
 
 
+def run_setup_and_exit():
+    """Run setup on all essential modules and exit."""
+    error_code = 0
+    try:
+        setup.setup_all_modules(essential=True)
+    except Exception as exception:
+        logger.error('Error running setup - %s', exception)
+        error_code = 1
+
+    sys.exit(error_code)
+
+
 def run_diagnostics_and_exit():
     """Run diagostics on all modules and exit."""
     module = importlib.import_module('plinth.modules.diagnostics.diagnostics')
@@ -315,6 +330,9 @@ def main():
 
     module_loader.load_modules()
 
+    if arguments.setup:
+        run_setup_and_exit()
+
     if arguments.diagnose:
         run_diagnostics_and_exit()
 
diff --git a/plinth/middleware.py b/plinth/middleware.py
new file mode 100644
index 000000000..b4ad0f0b4
--- /dev/null
+++ b/plinth/middleware.py
@@ -0,0 +1,75 @@
+#
+# This file is part of Plinth.
+#
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU Affero General Public License as
+# published by the Free Software Foundation, either version 3 of the
+# License, or (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU Affero General Public License for more details.
+#
+# You should have received a copy of the GNU Affero General Public License
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+#
+
+"""
+Django middleware to show pre-setup message and setup progress.
+"""
+
+from django.contrib import messages
+from django.core.urlresolvers import resolve
+from django.utils.translation import ugettext_lazy as _
+import logging
+
+import plinth
+from plinth.package import PackageException
+from . import views
+
+
+logger = logging.getLogger(__name__)
+
+
+class SetupMiddleware(object):
+    """Show setup page or progress if setup is neccessary or running."""
+
+    @staticmethod
+    def process_request(request):
+        """Handle a request as Django middleware request handler."""
+        # Perform a URL resolution. This is slightly inefficient as
+        # Django will do this resolution again.
+        resolver_match = resolve(request.path_info)
+        if not resolver_match.namespaces or not len(resolver_match.namespaces):
+            # Requested URL does not belong to any application
+            return
+
+        module_name = resolver_match.namespaces[0]
+        module = plinth.module_loader.loaded_modules[module_name]
+
+        # Collect errors from any previous operations and show them
+        if module.setup_helper.is_finished:
+            exception = module.setup_helper.collect_result()
+            if not exception:
+                messages.success(request, _('Application installed.'))
+            else:
+                if isinstance(exception, PackageException):
+                    error_string = getattr(exception, 'error_string',
+                                           str(exception))
+                    error_details = getattr(exception, 'error_details', '')
+                    message = _('Error installing application: {string} '
+                                '{details}').format(
+                        string=error_string, details=error_details)
+                else:
+                    message = _('Error installing application: {error}') \
+                        .format(error=exception)
+
+                messages.error(request, message)
+
+        # Check if application is up-to-date
+        if module.setup_helper.get_state() == 'up-to-date':
+            return
+
+        view = views.SetupView.as_view()
+        return view(request, setup_helper=module.setup_helper)
diff --git a/plinth/migrations/0002_modulestore.py b/plinth/migrations/0002_modulestore.py
new file mode 100644
index 000000000..43b81c064
--- /dev/null
+++ b/plinth/migrations/0002_modulestore.py
@@ -0,0 +1,22 @@
+# -*- coding: utf-8 -*-
+# Generated by Django 1.9.2 on 2016-02-10 12:30
+from __future__ import unicode_literals
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('plinth', '0001_initial'),
+    ]
+
+    operations = [
+        migrations.CreateModel(
+            name='Module',
+            fields=[
+                ('name', models.TextField(primary_key=True, serialize=False)),
+                ('setup_version', models.IntegerField()),
+            ],
+        ),
+    ]
diff --git a/plinth/models.py b/plinth/models.py
index 8dc1cfd03..bf2bf3350 100644
--- a/plinth/models.py
+++ b/plinth/models.py
@@ -37,3 +37,9 @@ class KVStore(models.Model):
     def value(self, val):
         """Store the value of the key/value pair by JSON encoding it"""
         self.value_json = json.dumps(val)
+
+
+class Module(models.Model):
+    """Model to store current setup versions of a module."""
+    name = models.TextField(primary_key=True)
+    setup_version = models.IntegerField()
diff --git a/plinth/module_loader.py b/plinth/module_loader.py
index e8cfd6dc9..272c1ae78 100644
--- a/plinth/module_loader.py
+++ b/plinth/module_loader.py
@@ -19,6 +19,7 @@
 Discover, load and manage Plinth modules
 """
 
+import collections
 import django
 import importlib
 import logging
@@ -27,11 +28,12 @@ import re
 
 from plinth import cfg
 from plinth import urls
+from plinth import setup
 from plinth.signals import pre_module_loading, post_module_loading
 
-LOGGER = logging.getLogger(__name__)
+logger = logging.getLogger(__name__)
 
-loaded_modules = []
+loaded_modules = collections.OrderedDict()
 _modules_to_load = None
 
 
@@ -42,16 +44,18 @@ def load_modules():
     """
     pre_module_loading.send_robust(sender="module_loader")
     modules = {}
-    for module_name in get_modules_to_load():
-        LOGGER.info('Importing %s', module_name)
+    for module_import_path in get_modules_to_load():
+        logger.info('Importing %s', module_import_path)
+        module_name = module_import_path.split('.')[-1]
         try:
-            modules[module_name] = importlib.import_module(module_name)
+            modules[module_name] = importlib.import_module(module_import_path)
         except Exception as exception:
-            LOGGER.exception('Could not import %s: %s', module_name, exception)
+            logger.exception('Could not import %s: %s', module_import_path,
+                             exception)
             if cfg.debug:
                 raise
 
-        _include_module_urls(module_name)
+        _include_module_urls(module_import_path, module_name)
 
     ordered_modules = []
     remaining_modules = dict(modules)  # Make a copy
@@ -64,14 +68,14 @@ def load_modules():
             _insert_modules(module_name, module, remaining_modules,
                             ordered_modules)
         except KeyError:
-            LOGGER.error('Unsatified dependency for module - %s',
+            logger.error('Unsatified dependency for module - %s',
                          module_name)
 
-    LOGGER.debug('Module load order - %s', ordered_modules)
+    logger.debug('Module load order - %s', ordered_modules)
 
     for module_name in ordered_modules:
-        _initialize_module(modules[module_name])
-        loaded_modules.append(module_name)
+        _initialize_module(module_name, modules[module_name])
+        loaded_modules[module_name] = modules[module_name]
 
     post_module_loading.send_robust(sender="module_loader")
 
@@ -94,7 +98,7 @@ def _insert_modules(module_name, module, remaining_modules, ordered_modules):
         try:
             module = remaining_modules.pop(dependency)
         except KeyError:
-            LOGGER.error('Not found or circular dependency - %s, %s',
+            logger.error('Not found or circular dependency - %s, %s',
                          module_name, dependency)
             raise
 
@@ -103,32 +107,34 @@ def _insert_modules(module_name, module, remaining_modules, ordered_modules):
     ordered_modules.append(module_name)
 
 
-def _include_module_urls(module_name):
+def _include_module_urls(module_import_path, module_name):
     """Include the module's URLs in global project URLs list"""
-    namespace = module_name.split('.')[-1]
-    url_module = module_name + '.urls'
+    url_module = module_import_path + '.urls'
     try:
         urls.urlpatterns += [
             django.conf.urls.url(
-                r'', django.conf.urls.include(url_module, namespace))]
+                r'', django.conf.urls.include(url_module, module_name))]
     except ImportError:
-        LOGGER.debug('No URLs for %s', module_name)
+        logger.debug('No URLs for %s', module_name)
         if cfg.debug:
             raise
 
 
-def _initialize_module(module):
+def _initialize_module(module_name, module):
     """Call initialization method in the module if it exists"""
+    # Perform setup related initialization on the module
+    setup.init(module_name, module)
+
     try:
         init = module.init
     except AttributeError:
-        LOGGER.debug('No init() for module - %s', module.__name__)
+        logger.debug('No init() for module - %s', module.__name__)
         return
 
     try:
         init()
     except Exception as exception:
-        LOGGER.exception('Exception while running init for %s: %s',
+        logger.exception('Exception while running init for %s: %s',
                          module, exception)
         if cfg.debug:
             raise
diff --git a/plinth/modules/apps/__init__.py b/plinth/modules/apps/__init__.py
index 28d22ea0b..b7edfd994 100644
--- a/plinth/modules/apps/__init__.py
+++ b/plinth/modules/apps/__init__.py
@@ -23,3 +23,7 @@ from . import apps
 from .apps import init
 
 __all__ = ['apps', 'init']
+
+version = 1
+
+is_essential = 1
diff --git a/plinth/modules/avahi/__init__.py b/plinth/modules/avahi/__init__.py
index 7c8f5592c..c4c0970bc 100644
--- a/plinth/modules/avahi/__init__.py
+++ b/plinth/modules/avahi/__init__.py
@@ -20,16 +20,32 @@ Plinth module for service discovery.
 """
 
 from django.utils.translation import ugettext_lazy as _
-import subprocess
 
-from plinth import actions
 from plinth import action_utils
 from plinth import cfg
 from plinth import service as service_module
+from plinth.utils import format_lazy
 
 # pylint: disable=C0103
 
-depends = ['plinth.modules.system']
+version = 1
+
+is_essential = True
+
+depends = ['system']
+
+title = _('Service Discovery')
+
+description = [
+    format_lazy(
+        _('Service discovery allows other devices on the network to '
+          'discover your {{ box_name }} and services running on it.  It '
+          'also allows {{ box_name }} to discover other devices and '
+          'services running on your local network.  Service discovery is '
+          'not essential and works only on internal networks.  It may be '
+          'disabled to improve security especially when connecting to a '
+          'hostile local network.'), box_name=_(cfg.box_name))
+]
 
 service = None
 
@@ -37,13 +53,16 @@ service = None
 def init():
     """Intialize the service discovery module."""
     menu = cfg.main_menu.get('system:index')
-    menu.add_urlname(_('Service Discovery'), 'glyphicon-lamp',
-                     'avahi:index', 950)
+    menu.add_urlname(title, 'glyphicon-lamp', 'avahi:index', 950)
 
     global service  # pylint: disable=W0603
     service = service_module.Service(
-        'avahi', _('Service Discovery'), ['mdns'],
-        is_external=False, enabled=is_enabled())
+        'avahi', title, ['mdns'], is_external=False, enabled=is_enabled())
+
+
+def setup(helper, old_version=False):
+    """Install and configure the module."""
+    helper.install(['avahi-daemon'])
 
 
 def is_enabled():
diff --git a/plinth/modules/avahi/templates/avahi.html b/plinth/modules/avahi/templates/avahi.html
index c3d1b98d7..193a1ac07 100644
--- a/plinth/modules/avahi/templates/avahi.html
+++ b/plinth/modules/avahi/templates/avahi.html
@@ -1,4 +1,4 @@
-{% extends "base.html" %}
+{% extends "app.html" %}
 {% comment %}
 #
 # This file is part of Plinth.
@@ -21,21 +21,7 @@
 {% load bootstrap %}
 {% load i18n %}
 
-{% block content %}
-
-  <h2>{% trans "Service Discovery" %}</h2>
-
-  <p>
-    {% blocktrans trimmed %}
-      Service discovery allows other devices on the network to
-      discover your {{ box_name }} and services running on it.  It
-      also allows {{ box_name }} to discover other devices and
-      services running on your local network.  Service discovery is
-      not essential and works only on internal networks.  It may be
-      disabled to improve security especially when connecting to a
-      hostile local network.
-    {% endblocktrans %}
-  </p>
+{% block configuration %}
 
   <h3>{% trans "Status" %}</h3>
 
diff --git a/plinth/modules/avahi/views.py b/plinth/modules/avahi/views.py
index e8fa4b61c..77751abca 100644
--- a/plinth/modules/avahi/views.py
+++ b/plinth/modules/avahi/views.py
@@ -26,14 +26,12 @@ import logging
 
 from .forms import ServiceDiscoveryForm
 from plinth import actions
-from plinth import package
 from plinth.modules import avahi
 
 
 logger = logging.getLogger(__name__)  # pylint: disable=C0103
 
 
-@package.required(['avahi-daemon'])
 def index(request):
     """Serve configuration page."""
     status = get_status()
@@ -50,7 +48,8 @@ def index(request):
         form = ServiceDiscoveryForm(initial=status, prefix='avahi')
 
     return TemplateResponse(request, 'avahi.html',
-                            {'title': _('Service Discovery'),
+                            {'title': avahi.title,
+                             'description': avahi.description,
                              'status': status,
                              'form': form})
 
diff --git a/plinth/modules/config/__init__.py b/plinth/modules/config/__init__.py
index 12cb341ff..c1bf7de04 100644
--- a/plinth/modules/config/__init__.py
+++ b/plinth/modules/config/__init__.py
@@ -24,6 +24,8 @@ from .config import init
 
 __all__ = ['config', 'init']
 
-depends = ['plinth.modules.system',
-           'plinth.modules.firewall',
-           'plinth.modules.names']
+version = 1
+
+is_essential = True
+
+depends = ['system', 'firewall', 'names']
diff --git a/plinth/modules/config/config.py b/plinth/modules/config/config.py
index f730f83d1..54c687c2b 100644
--- a/plinth/modules/config/config.py
+++ b/plinth/modules/config/config.py
@@ -33,7 +33,7 @@ import socket
 
 from plinth import actions
 from plinth import cfg
-from plinth.modules.firewall import firewall
+from plinth.modules import firewall
 from plinth.modules.names import SERVICES
 from plinth.signals import pre_hostname_change, post_hostname_change
 from plinth.signals import domainname_change
diff --git a/plinth/modules/config/urls.py b/plinth/modules/config/urls.py
index 35f392f31..846f6e19f 100644
--- a/plinth/modules/config/urls.py
+++ b/plinth/modules/config/urls.py
@@ -19,7 +19,7 @@
 URLs for the Configuration module
 """
 
-from django.conf.urls import patterns, url
+from django.conf.urls import url
 
 from . import config as views
 
diff --git a/plinth/modules/datetime/__init__.py b/plinth/modules/datetime/__init__.py
index 147b95146..0c200169a 100644
--- a/plinth/modules/datetime/__init__.py
+++ b/plinth/modules/datetime/__init__.py
@@ -22,13 +22,23 @@ Plinth module to configure system date and time
 from django.utils.translation import ugettext_lazy as _
 import subprocess
 
-from plinth import actions
 from plinth import action_utils
 from plinth import cfg
 from plinth import service as service_module
 
 
-depends = ['plinth.modules.system']
+version = 1
+
+is_essential = True
+
+depends = ['system']
+
+title = _('Date & Time')
+
+description = [
+    _('Network time server is a program that maintians the system time '
+      'in synchronization with servers on the Internet.')
+]
 
 service = None
 
@@ -36,13 +46,17 @@ service = None
 def init():
     """Intialize the date/time module."""
     menu = cfg.main_menu.get('system:index')
-    menu.add_urlname(_('Date & Time'), 'glyphicon-time',
-                     'datetime:index', 900)
+    menu.add_urlname(title, 'glyphicon-time', 'datetime:index', 900)
 
     global service
     service = service_module.Service(
-        'ntp', _('Network Time Server'),
-        is_external=False, enabled=is_enabled())
+        'ntp', title, is_external=False, enabled=is_enabled())
+
+
+def setup(helper, old_version=None):
+    """Install and configure the module."""
+    helper.install(['ntp'])
+    helper.call('post', service.notify_enabled, None, True)
 
 
 def is_enabled():
diff --git a/plinth/modules/datetime/templates/datetime.html b/plinth/modules/datetime/templates/datetime.html
index bce9499f2..d0a7aa407 100644
--- a/plinth/modules/datetime/templates/datetime.html
+++ b/plinth/modules/datetime/templates/datetime.html
@@ -1,4 +1,4 @@
-{% extends "base.html" %}
+{% extends "app.html" %}
 {% comment %}
 #
 # This file is part of Plinth.
@@ -21,16 +21,7 @@
 {% load bootstrap %}
 {% load i18n %}
 
-{% block content %}
-
-  <h2>{% trans "Date & Time" %}</h2>
-
-  <p>
-    {% blocktrans trimmed %}
-      Network time server is a program that maintians the system time
-      in synchronization with servers on the Internet.
-    {% endblocktrans %}
-  </p>
+{% block configuration %}
 
   <h3>{% trans "Status" %}</h3>
 
diff --git a/plinth/modules/datetime/views.py b/plinth/modules/datetime/views.py
index 51ea7e57c..f687e1506 100644
--- a/plinth/modules/datetime/views.py
+++ b/plinth/modules/datetime/views.py
@@ -26,18 +26,11 @@ import logging
 
 from .forms import DateTimeForm
 from plinth import actions
-from plinth import package
 from plinth.modules import datetime
 
 logger = logging.getLogger(__name__)
 
 
-def on_install():
-    """Notify that the service is now enabled."""
-    datetime.service.notify_enabled(None, True)
-
-
-@package.required(['ntp'], on_install=on_install)
 def index(request):
     """Serve configuration page."""
     status = get_status()
@@ -55,7 +48,8 @@ def index(request):
         form = DateTimeForm(initial=status, prefix='datetime')
 
     return TemplateResponse(request, 'datetime.html',
-                            {'title': _('Date & Time'),
+                            {'title': datetime.title,
+                             'description': datetime.description,
                              'status': status,
                              'form': form})
 
diff --git a/plinth/modules/deluge/__init__.py b/plinth/modules/deluge/__init__.py
index 7038d3696..f5c1b6f37 100644
--- a/plinth/modules/deluge/__init__.py
+++ b/plinth/modules/deluge/__init__.py
@@ -27,7 +27,20 @@ from plinth import cfg
 from plinth import service as service_module
 
 
-depends = ['plinth.modules.apps']
+version = 1
+
+depends = ['apps']
+
+title = _('BitTorrent Web Client (Deluge)')
+
+description = [
+    _('Deluge is a BitTorrent client that features a Web UI.'),
+
+    _('When enabled, the Deluge web client will be available from '
+      '<a href="/deluge">/deluge</a> path on the web server. The '
+      'default password is \'deluge\', but you should log in and change '
+      'it immediately after enabling this service.')
+]
 
 service = None
 
@@ -35,13 +48,19 @@ service = None
 def init():
     """Initialize the Deluge module."""
     menu = cfg.main_menu.get('apps:index')
-    menu.add_urlname(_('BitTorrent (Deluge)'), 'glyphicon-magnet',
-                     'deluge:index', 200)
+    menu.add_urlname(title, 'glyphicon-magnet', 'deluge:index', 200)
 
     global service
     service = service_module.Service(
-        'deluge', _('Deluge BitTorrent'), ['http', 'https'],
-        is_external=True, enabled=is_enabled())
+        'deluge', title, ['http', 'https'], is_external=True,
+        enabled=is_enabled())
+
+
+def setup(helper, old_version=None):
+    """Install and configure the module."""
+    helper.install(['deluged', 'deluge-web'])
+    helper.call('post', actions.superuser_run, 'deluge', ['enable'])
+    helper.call('post', service.notify_enabled, None, True)
 
 
 def is_enabled():
diff --git a/plinth/modules/deluge/templates/deluge.html b/plinth/modules/deluge/templates/deluge.html
index 51b54c8ef..019c91b64 100644
--- a/plinth/modules/deluge/templates/deluge.html
+++ b/plinth/modules/deluge/templates/deluge.html
@@ -1,4 +1,4 @@
-{% extends "base.html" %}
+{% extends "app.html" %}
 {% comment %}
 #
 # This file is part of Plinth.
@@ -21,20 +21,7 @@
 {% load bootstrap %}
 {% load i18n %}
 
-{% block content %}
-
-  <h2>{% trans "BitTorrent Web Client (Deluge)" %}</h2>
-
-  <p>{% trans "Deluge is a BitTorrent client that features a Web UI." %}</p>
-
-  <p>
-    {% blocktrans trimmed %}
-      When enabled, the Deluge web client will be available from
-      <a href="/deluge">/deluge</a> path on the web server. The
-      default password is 'deluge', but you should log in and change
-      it immediately after enabling this service.
-    {% endblocktrans %}
-  </p>
+{% block configuration %}
 
   <h3>{% trans "Status" %}</h3>
 
diff --git a/plinth/modules/deluge/views.py b/plinth/modules/deluge/views.py
index 475cffb30..0b48b2333 100644
--- a/plinth/modules/deluge/views.py
+++ b/plinth/modules/deluge/views.py
@@ -25,17 +25,9 @@ from django.utils.translation import ugettext as _
 
 from .forms import DelugeForm
 from plinth import actions
-from plinth import package
 from plinth.modules import deluge
 
 
-def on_install():
-    """Tasks to run after package install."""
-    actions.superuser_run('deluge', ['enable'])
-    deluge.service.notify_enabled(None, True)
-
-
-@package.required(['deluged', 'deluge-web'], on_install=on_install)
 def index(request):
     """Serve configuration page."""
     status = get_status()
@@ -53,7 +45,8 @@ def index(request):
         form = DelugeForm(initial=status, prefix='deluge')
 
     return TemplateResponse(request, 'deluge.html',
-                            {'title': _('BitTorrent (Deluge)'),
+                            {'title': deluge.title,
+                             'description': deluge.description,
                              'status': status,
                              'form': form})
 
diff --git a/plinth/modules/diagnostics/__init__.py b/plinth/modules/diagnostics/__init__.py
index 8005882b3..f532db3ee 100644
--- a/plinth/modules/diagnostics/__init__.py
+++ b/plinth/modules/diagnostics/__init__.py
@@ -19,13 +19,30 @@
 Plinth module for system diagnostics
 """
 
-from . import diagnostics
-from .diagnostics import init
+from django.utils.translation import ugettext_lazy as _
+
 from plinth import action_utils
+from plinth import cfg
 
-__all__ = ['diagnostics', 'init']
+version = 1
 
-depends = ['plinth.modules.system']
+is_essential = True
+
+title = _('Diagnostics')
+
+description = [
+    _('The system diagnostic test will run a number of checks on your '
+      'system to confirm that applications and services are working as '
+      'expected.')
+]
+
+depends = ['system']
+
+
+def init():
+    """Initialize the module"""
+    menu = cfg.main_menu.get('system:index')
+    menu.add_urlname(title, 'glyphicon-screenshot', 'diagnostics:index', 30)
 
 
 def diagnose():
diff --git a/plinth/modules/diagnostics/diagnostics.py b/plinth/modules/diagnostics/diagnostics.py
index 19ab23e7d..a44539afe 100644
--- a/plinth/modules/diagnostics/diagnostics.py
+++ b/plinth/modules/diagnostics/diagnostics.py
@@ -24,12 +24,11 @@ from django.http import Http404
 from django.template.response import TemplateResponse
 from django.views.decorators.http import require_POST
 from django.utils.translation import ugettext_lazy as _
-import importlib
 import logging
 import threading
 
-from plinth import cfg
 from plinth import module_loader
+from plinth.modules import diagnostics
 
 
 logger = logging.Logger(__name__)
@@ -39,20 +38,14 @@ current_results = {}
 _running_task = None
 
 
-def init():
-    """Initialize the module"""
-    menu = cfg.main_menu.get('system:index')
-    menu.add_urlname(_('Diagnostics'), 'glyphicon-screenshot',
-                     'diagnostics:index', 30)
-
-
 def index(request):
     """Serve the index page"""
     if request.method == 'POST' and not _running_task:
         _start_task()
 
     return TemplateResponse(request, 'diagnostics.html',
-                            {'title': _('System Diagnostics'),
+                            {'title': diagnostics.title,
+                             'description': diagnostics.description,
                              'is_running': _running_task is not None,
                              'results': current_results})
 
@@ -60,19 +53,14 @@ def index(request):
 @require_POST
 def module(request, module_name):
     """Return diagnostics for a particular module."""
-    found = False
-    for module_import_path in module_loader.loaded_modules:
-        if module_name == module_import_path.split('.')[-1]:
-            found = True
-            break
-
-    if not found:
+    try:
+        module = module_loader.loaded_modules[module_name]
+    except KeyError:
         raise Http404('Module does not exist or not loaded')
 
-    loaded_module = importlib.import_module(module_import_path)
     results = []
-    if hasattr(loaded_module, 'diagnose'):
-        results = loaded_module.diagnose()
+    if hasattr(module, 'diagnose'):
+        results = module.diagnose()
 
     return TemplateResponse(request, 'diagnostics_module.html',
                             {'title': _('Diagnostic Test'),
@@ -110,17 +98,15 @@ def run_on_all_modules():
                        'progress_percentage': 0}
 
     modules = []
-    for module_import_path in module_loader.loaded_modules:
-        loaded_module = importlib.import_module(module_import_path)
-        if not hasattr(loaded_module, 'diagnose'):
+    for module_name, module in module_loader.loaded_modules.items():
+        if not hasattr(module, 'diagnose'):
             continue
 
-        module_name = module_import_path.split('.')[-1]
-        modules.append((module_name, loaded_module))
+        modules.append((module_name, module))
         current_results['results'][module_name] = None
 
     current_results['modules'] = modules
-    for current_index, (module_name, loaded_module) in enumerate(modules):
-        current_results['results'][module_name] = loaded_module.diagnose()
+    for current_index, (module_name, module) in enumerate(modules):
+        current_results['results'][module_name] = module.diagnose()
         current_results['progress_percentage'] = \
             int((current_index + 1) * 100 / len(modules))
diff --git a/plinth/modules/diagnostics/templates/diagnostics.html b/plinth/modules/diagnostics/templates/diagnostics.html
index 2b369732e..066222347 100644
--- a/plinth/modules/diagnostics/templates/diagnostics.html
+++ b/plinth/modules/diagnostics/templates/diagnostics.html
@@ -1,4 +1,4 @@
-{% extends 'base.html' %}
+{% extends 'app.html' %}
 {% comment %}
 #
 # This file is part of Plinth.
@@ -29,17 +29,7 @@
 {% endblock %}
 
 
-{% block content %}
-
-  <h2>{{ title }}</h2>
-
-  <p>
-    {% blocktrans trimmed %}
-      The system diagnostic test will run a number of checks on your
-      system to confirm that applications and services are working as
-      expected.
-    {% endblocktrans %}
-  </p>
+{% block configuration %}
 
   {% if not is_running %}
     <form class="form form-diagnostics-button" method="post"
diff --git a/plinth/modules/dynamicdns/__init__.py b/plinth/modules/dynamicdns/__init__.py
index 747482e9d..c47942f6e 100644
--- a/plinth/modules/dynamicdns/__init__.py
+++ b/plinth/modules/dynamicdns/__init__.py
@@ -19,9 +19,42 @@
 Plinth module to configure ez-ipupdate client
 """
 
-from . import dynamicdns
-from .dynamicdns import init
+from django.utils.translation import ugettext_lazy as _
 
-__all__ = ['dynamicdns', 'init']
+from plinth import cfg
+from plinth.utils import format_lazy
 
-depends = ['plinth.modules.apps']
+version = 1
+
+depends = ['apps']
+
+title = _('Dynamic DNS Client')
+
+description = [
+    format_lazy(
+        _('If your internet provider changes your IP address periodic '
+          '(i.e. every 24h) it may be hard for others to find you in the '
+          'WEB. And for this reason nobody may find the services which are '
+          'provided by {box_name}, such as ownCloud.'),
+        box_name=_(cfg.box_name)),
+
+    _('The solution is to assign a DNS name to your IP address and '
+      'update the DNS name every time your IP is changed by your '
+      'Internet provider. Dynamic DNS allows you to push your current '
+      'public IP address to an '
+      '<a href=\'http://gnudip2.sourceforge.net/\' target=\'_blank\'> '
+      'gnudip </a> server. Afterwards the Server will assign your DNS name '
+      'with the new IP and if someone from the Internet asks for your DNS '
+      'name he will get your current IP answered.')
+]
+
+
+def init():
+    """Initialize the module."""
+    menu = cfg.main_menu.get('apps:index')
+    menu.add_urlname(title, 'glyphicon-refresh', 'dynamicdns:index', 500)
+
+
+def setup(helper, old_version=None):
+    """Install and configure the module."""
+    helper.install(['ez-ipupdate'])
diff --git a/plinth/modules/dynamicdns/dynamicdns.py b/plinth/modules/dynamicdns/dynamicdns.py
index 490ec98c6..b15e49b59 100644
--- a/plinth/modules/dynamicdns/dynamicdns.py
+++ b/plinth/modules/dynamicdns/dynamicdns.py
@@ -25,7 +25,7 @@ import logging
 
 from plinth import actions
 from plinth import cfg
-from plinth import package
+from plinth.modules import dynamicdns
 from plinth.utils import format_lazy
 
 logger = logging.getLogger(__name__)
@@ -39,19 +39,11 @@ subsubmenu = [{'url': reverse_lazy('dynamicdns:index'),
                'text': ugettext_lazy('Status')}]
 
 
-def init():
-    """Initialize the dynamicdns module"""
-    menu = cfg.main_menu.get('apps:index')
-    menu.add_urlname(ugettext_lazy('Dynamic DNS'), 'glyphicon-refresh',
-                     'dynamicdns:index', 500)
-
-
-@package.required(['ez-ipupdate'])
 def index(request):
     """Serve Dynamic DNS page."""
-
     return TemplateResponse(request, 'dynamicdns.html',
-                            {'title': _('Dynamic DNS'),
+                            {'title': dynamicdns.title,
+                             'description': dynamicdns.description,
                              'subsubmenu': subsubmenu})
 
 
@@ -198,7 +190,6 @@ class ConfigureForm(forms.Form):
                 raise forms.ValidationError(_('Please provide a password'))
 
 
-@package.required(['ez-ipupdate'])
 def configure(request):
     """Serve the configuration form."""
     status = get_status()
@@ -219,7 +210,6 @@ def configure(request):
                              'subsubmenu': subsubmenu})
 
 
-@package.required(['ez-ipupdate'])
 def statuspage(request):
     """Serve the status page."""
     check_nat = actions.run('dynamicdns', ['get-nat'])
diff --git a/plinth/modules/dynamicdns/templates/dynamicdns.html b/plinth/modules/dynamicdns/templates/dynamicdns.html
index 5ad1ec90b..1b3d1bfa7 100644
--- a/plinth/modules/dynamicdns/templates/dynamicdns.html
+++ b/plinth/modules/dynamicdns/templates/dynamicdns.html
@@ -1,4 +1,4 @@
-{% extends "base.html" %}
+{% extends "app.html" %}
 {% comment %}
 #
 # This file is part of Plinth.
@@ -20,32 +20,7 @@
 
 {% load i18n %}
 
-{% block content %}
-
-  <h2>{% trans "Dynamic DNS Client" %}</h2>
-
-  <p>
-    {% blocktrans trimmed %}
-      If your internet provider changes your IP address periodic
-      (i.e. every 24h) it may be hard for others to find you in the
-      WEB. And for this reason nobody may find the services which are
-      provided by {{ box_name }}, such as ownCloud.
-    {% endblocktrans %}
-  </p>
-
-  <p>
-    {% blocktrans trimmed %}
-      The solution is to assign a DNS name to your IP address and
-      update the DNS name every time your IP is changed by your
-      Internet provider. Dynamic DNS allows you to push your current
-      public IP address to an
-      <a href='http://gnudip2.sourceforge.net/' target='_blank'> gnudip </a>
-      server. Afterwards the Server will assign your DNS name with the
-      new IP and if someone from the Internet asks for your DNS name
-      he will get your current IP answered.
-    {% endblocktrans %}
-  </p>
-
+{% block configuration %}
   <p>
     {% blocktrans trimmed %}
       If you are looking for a free dynamic DNS account, you may find
diff --git a/plinth/modules/firewall/__init__.py b/plinth/modules/firewall/__init__.py
index 27daf85a0..96cb449a1 100644
--- a/plinth/modules/firewall/__init__.py
+++ b/plinth/modules/firewall/__init__.py
@@ -19,9 +19,119 @@
 Plinth module to configure a firewall
 """
 
-from . import firewall
-from .firewall import init
+from django.utils.translation import ugettext_lazy as _
+import logging
 
-__all__ = ['firewall', 'init']
+from plinth import actions
+from plinth import cfg
+from plinth.signals import service_enabled
+import plinth.service as service_module
+from plinth.utils import format_lazy
 
-depends = ['plinth.modules.system']
+version = 1
+
+is_essential = True
+
+depends = ['system']
+
+title = _('Firewall')
+
+description = [
+    format_lazy(
+        _('Firewall is a security system that controls the incoming and '
+          'outgoing network traffic on your {box_name}. Keeping a '
+          'firewall enabled and properly configured reduces risk of '
+          'security threat from the Internet.'), box_name=cfg.box_name)
+]
+
+LOGGER = logging.getLogger(__name__)
+
+
+def init():
+    """Initailze firewall module"""
+    menu = cfg.main_menu.get('system:index')
+    menu.add_urlname(title, 'glyphicon-fire', 'firewall:index', 50)
+
+    service_enabled.connect(on_service_enabled)
+
+
+def setup(helper, old_version=None):
+    """Install and configure the module."""
+    helper.install(['firewalld'])
+
+
+def get_enabled_status():
+    """Return whether firewall is enabled"""
+    output = _run(['get-status'], superuser=True)
+    return output.split()[0] == 'running'
+
+
+def get_enabled_services(zone):
+    """Return the status of various services currently enabled"""
+    output = _run(['get-enabled-services', '--zone', zone], superuser=True)
+    return output.split()
+
+
+def add_service(port, zone):
+    """Enable a service in firewall"""
+    _run(['add-service', port, '--zone', zone], superuser=True)
+
+
+def remove_service(port, zone):
+    """Remove a service in firewall"""
+    _run(['remove-service', port, '--zone', zone], superuser=True)
+
+
+def on_service_enabled(sender, service_id, enabled, **kwargs):
+    """
+    Enable/disable firewall ports when a service is
+    enabled/disabled.
+    """
+    del sender  # Unused
+    del kwargs  # Unused
+
+    internal_enabled_services = get_enabled_services(zone='internal')
+    external_enabled_services = get_enabled_services(zone='external')
+
+    LOGGER.info('Service enabled - %s, %s', service_id, enabled)
+    service = service_module.services[service_id]
+    for port in service.ports:
+        if enabled:
+            if port not in internal_enabled_services:
+                add_service(port, zone='internal')
+
+            if (service.is_external and
+                    port not in external_enabled_services):
+                add_service(port, zone='external')
+            else:
+                # service already configured.
+                pass
+        else:
+            if port in internal_enabled_services:
+                enabled_services_on_port = [
+                    service_.is_enabled()
+                    for service_ in service_module.services.values()
+                    if port in service_.ports and
+                    service_id != service_.service_id]
+                if not any(enabled_services_on_port):
+                    remove_service(port, zone='internal')
+
+            if port in external_enabled_services:
+                enabled_services_on_port = [
+                    service_.is_enabled()
+                    for service_ in service_module.services.values()
+                    if port in service_.ports and
+                    service_id != service_.service_id and
+                    service_.is_external]
+                if not any(enabled_services_on_port):
+                    remove_service(port, zone='external')
+
+
+def _run(arguments, superuser=False):
+    """Run an given command and raise exception if there was an error"""
+    command = 'firewall'
+
+    if superuser:
+        return actions.superuser_run(command, arguments)
+    else:
+        return actions.run(command, arguments)
diff --git a/plinth/modules/firewall/firewall.py b/plinth/modules/firewall/firewall.py
deleted file mode 100644
index dc693af90..000000000
--- a/plinth/modules/firewall/firewall.py
+++ /dev/null
@@ -1,137 +0,0 @@
-#
-# This file is part of Plinth.
-#
-# This program is free software: you can redistribute it and/or modify
-# it under the terms of the GNU Affero General Public License as
-# published by the Free Software Foundation, either version 3 of the
-# License, or (at your option) any later version.
-#
-# This program is distributed in the hope that it will be useful,
-# but WITHOUT ANY WARRANTY; without even the implied warranty of
-# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-# GNU Affero General Public License for more details.
-#
-# You should have received a copy of the GNU Affero General Public License
-# along with this program.  If not, see <http://www.gnu.org/licenses/>.
-#
-
-"""
-Plinth module to configure a firewall
-"""
-
-from django.template.response import TemplateResponse
-from django.utils.translation import ugettext_lazy as _
-import logging
-
-from plinth import actions
-from plinth import cfg
-from plinth import package
-from plinth.signals import service_enabled
-import plinth.service as service_module
-
-
-LOGGER = logging.getLogger(__name__)
-
-
-def init():
-    """Initailze firewall module"""
-    menu = cfg.main_menu.get('system:index')
-    menu.add_urlname(_('Firewall'), 'glyphicon-fire', 'firewall:index', 50)
-
-    service_enabled.connect(on_service_enabled)
-
-
-@package.required(['firewalld'])
-def index(request):
-    """Serve introcution page"""
-    if not get_enabled_status():
-        return TemplateResponse(request, 'firewall.html',
-                                {'title': _('Firewall'),
-                                 'firewall_status': 'not_running'})
-
-    internal_enabled_services = get_enabled_services(zone='internal')
-    external_enabled_services = get_enabled_services(zone='external')
-
-    return TemplateResponse(
-        request, 'firewall.html',
-        {'title': _('Firewall'),
-         'services': list(service_module.services.values()),
-         'internal_enabled_services': internal_enabled_services,
-         'external_enabled_services': external_enabled_services})
-
-
-def get_enabled_status():
-    """Return whether firewall is enabled"""
-    output = _run(['get-status'], superuser=True)
-    return output.split()[0] == 'running'
-
-
-def get_enabled_services(zone):
-    """Return the status of various services currently enabled"""
-    output = _run(['get-enabled-services', '--zone', zone], superuser=True)
-    return output.split()
-
-
-def add_service(port, zone):
-    """Enable a service in firewall"""
-    _run(['add-service', port, '--zone', zone], superuser=True)
-
-
-def remove_service(port, zone):
-    """Remove a service in firewall"""
-    _run(['remove-service', port, '--zone', zone], superuser=True)
-
-
-def on_service_enabled(sender, service_id, enabled, **kwargs):
-    """
-    Enable/disable firewall ports when a service is
-    enabled/disabled.
-    """
-    del sender  # Unused
-    del kwargs  # Unused
-
-    internal_enabled_services = get_enabled_services(zone='internal')
-    external_enabled_services = get_enabled_services(zone='external')
-
-    LOGGER.info('Service enabled - %s, %s', service_id, enabled)
-    service = service_module.services[service_id]
-    for port in service.ports:
-        if enabled:
-            if port not in internal_enabled_services:
-                add_service(port, zone='internal')
-
-            if (service.is_external and
-                    port not in external_enabled_services):
-                add_service(port, zone='external')
-            else:
-                # service already configured.
-                pass
-        else:
-            if port in internal_enabled_services:
-                enabled_services_on_port = [
-                    service_.is_enabled()
-                    for service_ in service_module.services.values()
-                    if port in service_.ports and
-                    service_id != service_.service_id]
-                if not any(enabled_services_on_port):
-                    remove_service(port, zone='internal')
-
-            if port in external_enabled_services:
-                enabled_services_on_port = [
-                    service_.is_enabled()
-                    for service_ in service_module.services.values()
-                    if port in service_.ports and
-                    service_id != service_.service_id and
-                    service_.is_external]
-                if not any(enabled_services_on_port):
-                    remove_service(port, zone='external')
-
-
-def _run(arguments, superuser=False):
-    """Run an given command and raise exception if there was an error"""
-    command = 'firewall'
-
-    if superuser:
-        return actions.superuser_run(command, arguments)
-    else:
-        return actions.run(command, arguments)
diff --git a/plinth/modules/firewall/templates/firewall.html b/plinth/modules/firewall/templates/firewall.html
index e59d4052d..ec2440702 100644
--- a/plinth/modules/firewall/templates/firewall.html
+++ b/plinth/modules/firewall/templates/firewall.html
@@ -1,4 +1,4 @@
-{% extends "base.html" %}
+{% extends "app.html" %}
 {% comment %}
 #
 # This file is part of Plinth.
@@ -20,18 +20,7 @@
 
 {% load i18n %}
 
-{% block content %}
-
-  <h2>{{ title }}</h2>
-
-  <p>
-    {% blocktrans trimmed %}
-      Firewall is a security system that controls the incoming and
-      outgoing network traffic on your {{ box_name }}. Keeping a
-      firewall enabled and properly configured reduces risk of
-      security threat from the Internet.
-    {% endblocktrans %}
-  </p>
+{% block configuration %}
 
   <p>{% trans "Current status:" %}</p>
 
diff --git a/plinth/modules/firewall/urls.py b/plinth/modules/firewall/urls.py
index 6448e89f6..8c6765af9 100644
--- a/plinth/modules/firewall/urls.py
+++ b/plinth/modules/firewall/urls.py
@@ -21,7 +21,7 @@ URLs for the Firewall module
 
 from django.conf.urls import url
 
-from . import firewall as views
+from . import views
 
 
 urlpatterns = [
diff --git a/plinth/modules/firewall/views.py b/plinth/modules/firewall/views.py
new file mode 100644
index 000000000..3dab988ab
--- /dev/null
+++ b/plinth/modules/firewall/views.py
@@ -0,0 +1,45 @@
+#
+# This file is part of Plinth.
+#
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU Affero General Public License as
+# published by the Free Software Foundation, either version 3 of the
+# License, or (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU Affero General Public License for more details.
+#
+# You should have received a copy of the GNU Affero General Public License
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+#
+
+"""
+Plinth module to configure a firewall
+"""
+
+from django.template.response import TemplateResponse
+
+from plinth.modules import firewall
+import plinth.service as service_module
+
+
+def index(request):
+    """Serve introcution page"""
+    if not firewall.get_enabled_status():
+        return TemplateResponse(request, 'firewall.html',
+                                {'title': firewall.title,
+                                 'description': firewall.description,
+                                 'firewall_status': 'not_running'})
+
+    internal_enabled_services = firewall.get_enabled_services(zone='internal')
+    external_enabled_services = firewall.get_enabled_services(zone='external')
+
+    return TemplateResponse(
+        request, 'firewall.html',
+        {'title': firewall.title,
+         'description': firewall.description,
+         'services': list(service_module.services.values()),
+         'internal_enabled_services': internal_enabled_services,
+         'external_enabled_services': external_enabled_services})
diff --git a/plinth/modules/first_boot/__init__.py b/plinth/modules/first_boot/__init__.py
index 558116da9..55d9941a0 100644
--- a/plinth/modules/first_boot/__init__.py
+++ b/plinth/modules/first_boot/__init__.py
@@ -18,3 +18,7 @@
 """
 Plinth module for first boot wizard
 """
+
+version = 1
+
+is_essential = True
diff --git a/plinth/modules/ikiwiki/__init__.py b/plinth/modules/ikiwiki/__init__.py
index 402f4b6ae..05f105743 100644
--- a/plinth/modules/ikiwiki/__init__.py
+++ b/plinth/modules/ikiwiki/__init__.py
@@ -27,7 +27,16 @@ from plinth import cfg
 from plinth import service as service_module
 
 
-depends = ['plinth.modules.apps']
+version = 1
+
+depends = ['apps']
+
+title = _('Wiki and Blog (ikiwiki)')
+
+description = [
+    _('When enabled, the blogs and wikis will be available '
+      'from <a href="/ikiwiki">/ikiwiki</a>.')
+]
 
 service = None
 
@@ -35,13 +44,25 @@ service = None
 def init():
     """Initialize the ikiwiki module."""
     menu = cfg.main_menu.get('apps:index')
-    menu.add_urlname(_('Wiki and Blog (ikiwiki)'), 'glyphicon-edit',
-                     'ikiwiki:index', 1100)
+    menu.add_urlname(title, 'glyphicon-edit', 'ikiwiki:index', 1100)
 
     global service
     service = service_module.Service(
-        'ikiwiki', _('ikiwiki wikis and blogs'), ['http', 'https'],
-        is_external=True, enabled=is_enabled())
+        'ikiwiki', title, ['http', 'https'], is_external=True,
+        enabled=is_enabled())
+
+
+def setup(helper, old_version=None):
+    """Install and configure the module."""
+    helper.install(['ikiwiki',
+                    'gcc',
+                    'libc6-dev',
+                    'libtimedate-perl',
+                    'libcgi-formbuilder-perl',
+                    'libcgi-session-perl',
+                    'libxml-writer-perl'])
+    helper.call('post', actions.superuser_run, 'ikiwiki', ['setup'])
+    helper.call('post', service.notify_enabled, None, True)
 
 
 def is_enabled():
diff --git a/plinth/modules/ikiwiki/templates/ikiwiki.html b/plinth/modules/ikiwiki/templates/ikiwiki.html
index 4cea868ad..e08738cf7 100644
--- a/plinth/modules/ikiwiki/templates/ikiwiki.html
+++ b/plinth/modules/ikiwiki/templates/ikiwiki.html
@@ -1,4 +1,4 @@
-{% extends "base.html" %}
+{% extends "app.html" %}
 {% comment %}
 #
 # This file is part of Plinth.
@@ -21,14 +21,7 @@
 {% load bootstrap %}
 {% load i18n %}
 
-{% block content %}
-
-  <p>
-    {% blocktrans trimmed %}
-      When enabled, the blogs and wikis will be available
-      from <a href="/ikiwiki">/ikiwiki</a>.
-    {% endblocktrans %}
-  </p>
+{% block configuration %}
 
   {% include "diagnostics_button.html" with module="ikiwiki" %}
 
diff --git a/plinth/modules/ikiwiki/views.py b/plinth/modules/ikiwiki/views.py
index 37bfaf5c3..27c1a855a 100644
--- a/plinth/modules/ikiwiki/views.py
+++ b/plinth/modules/ikiwiki/views.py
@@ -27,8 +27,6 @@ from django.utils.translation import ugettext as _, ugettext_lazy
 
 from .forms import IkiwikiForm, IkiwikiCreateForm
 from plinth import actions
-from plinth import action_utils
-from plinth import package
 from plinth.modules import ikiwiki
 
 
@@ -40,20 +38,6 @@ subsubmenu = [{'url': reverse_lazy('ikiwiki:index'),
                'text': ugettext_lazy('Create')}]
 
 
-def on_install():
-    """Enable ikiwiki on install."""
-    actions.superuser_run('ikiwiki', ['setup'])
-    ikiwiki.service.notify_enabled(None, True)
-
-
-@package.required(['ikiwiki',
-                   'gcc',
-                   'libc6-dev',
-                   'libtimedate-perl',
-                   'libcgi-formbuilder-perl',
-                   'libcgi-session-perl',
-                   'libxml-writer-perl'],
-                  on_install=on_install)
 def index(request):
     """Serve configuration page."""
     status = get_status()
@@ -70,7 +54,8 @@ def index(request):
         form = IkiwikiForm(initial=status, prefix='ikiwiki')
 
     return TemplateResponse(request, 'ikiwiki.html',
-                            {'title': _('Wiki and Blog'),
+                            {'title': ikiwiki.title,
+                             'description': ikiwiki.description,
                              'status': status,
                              'form': form,
                              'subsubmenu': subsubmenu})
diff --git a/plinth/modules/letsencrypt/__init__.py b/plinth/modules/letsencrypt/__init__.py
index 565d78bed..bfd630c16 100644
--- a/plinth/modules/letsencrypt/__init__.py
+++ b/plinth/modules/letsencrypt/__init__.py
@@ -20,20 +20,38 @@ Plinth module for using Let's Encrypt.
 """
 
 from django.utils.translation import ugettext_lazy as _
-import json
 
-from plinth import actions
 from plinth import action_utils
 from plinth import cfg
-from plinth import service as service_module
 from plinth.modules import names
+from plinth.utils import format_lazy
 
 
-depends = [
-    'plinth.modules.apps',
-    'plinth.modules.names'
+version = 1
+
+is_essential = True
+
+depends = ['apps', 'names']
+
+title = _('Certificates (Let\'s Encrypt)')
+
+description = [
+    format_lazy(
+        _('A digital certficate allows users of a web service to verify the '
+          'identity of the service and to securely communicate with it. '
+          '{box_name} can automatically obtain and setup digital '
+          'certificates for each available domain.  It does so by proving '
+          'itself to be the owner of a domain to Let\'s Encrypt, a '
+          'certficate authority (CA).'), box_name=_(cfg.box_name)),
+
+    _('Let\'s Encrypt is a free, automated, and open certificate '
+      'authority, run for the public’s benefit by the Internet Security '
+      'Research Group (ISRG).  Please read and agree with the '
+      '<a href="https://letsencrypt.org/repository/">Let\'s Encrypt '
+      'Subscriber Agreement</a> before using this service.')
 ]
 
+
 service = None
 
 
@@ -44,6 +62,11 @@ def init():
                      'glyphicon-lock', 'letsencrypt:index', 20)
 
 
+def setup(helper, old_version=None):
+    """Install and configure the module."""
+    helper.install(['letsencrypt'])
+
+
 def diagnose():
     """Run diagnostics and return the results."""
     results = []
diff --git a/plinth/modules/letsencrypt/templates/letsencrypt.html b/plinth/modules/letsencrypt/templates/letsencrypt.html
index 15043bdf2..1e3e29b2a 100644
--- a/plinth/modules/letsencrypt/templates/letsencrypt.html
+++ b/plinth/modules/letsencrypt/templates/letsencrypt.html
@@ -1,4 +1,4 @@
-{% extends "base.html" %}
+{% extends "app.html" %}
 {% comment %}
 #
 # This file is part of Plinth.
@@ -33,30 +33,7 @@
 </style>
 {% endblock %}
 
-{% block content %}
-
-  <h2>{% trans "Certificates (Let's Encrypt)" %}</h2>
-
-  <p>
-    {% blocktrans trimmed %}
-      A digital certficate allows users of a web service to verify the
-      identity of the service and to securely communicate with it.
-      {{ box_name }} can automatically obtain and setup digital
-      certificates for each available domain.  It does so by proving
-      itself to be the owner of a domain to Let's Encrypt, a
-      certficate authority (CA).
-    {% endblocktrans %}
-  </p>
-
-  <p>
-    {% blocktrans trimmed %}
-      Let's Encrypt is a free, automated, and open certificate
-      authority, run for the public’s benefit by the Internet Security
-      Research Group (ISRG).  Please read and agree with the
-      <a href="https://letsencrypt.org/repository/">Let's Encrypt
-      Subscriber Agreement</a> before using this service.
-    {% endblocktrans %}
-  </p>
+{% block configuration %}
 
   <div class="row">
     <div class="col-lg-8">
diff --git a/plinth/modules/letsencrypt/views.py b/plinth/modules/letsencrypt/views.py
index 46750c51b..c2a5ffbbd 100644
--- a/plinth/modules/letsencrypt/views.py
+++ b/plinth/modules/letsencrypt/views.py
@@ -29,20 +29,20 @@ import json
 import logging
 
 from plinth import actions
-from plinth import package
 from plinth.errors import ActionError
+from plinth.modules import letsencrypt
 from plinth.modules import names
 
 logger = logging.getLogger(__name__)
 
 
-@package.required(['letsencrypt'])
 def index(request):
     """Serve configuration page."""
     status = get_status()
 
     return TemplateResponse(request, 'letsencrypt.html',
-                            {'title': _('Certificates (Let\'s Encrypt)'),
+                            {'title': letsencrypt.title,
+                             'description': letsencrypt.description,
                              'status': status})
 
 
diff --git a/plinth/modules/monkeysphere/__init__.py b/plinth/modules/monkeysphere/__init__.py
index d9501870d..09be4a195 100644
--- a/plinth/modules/monkeysphere/__init__.py
+++ b/plinth/modules/monkeysphere/__init__.py
@@ -23,7 +23,22 @@ from django.utils.translation import ugettext_lazy as _
 
 from plinth import cfg
 
-depends = ['plinth.modules.system']
+version = 1
+
+depends = ['system']
+
+title = _('Monkeysphere')
+
+description = [
+    _('With Monkeysphere, a PGP key can be generated for each configured '
+      'domain serving SSH. The PGP public key can then be uploaded to the PGP '
+      'keyservers. Users connecting to this machine through SSH can verify '
+      'that they are connecting to the correct host.  For users to trust the '
+      'key, at least one person (usually the machine owner) must sign the key '
+      'using the regular PGP key signing process.  See the '
+      '<a href="http://web.monkeysphere.info/getting-started-ssh/"> '
+      'Monkeysphere SSH documentation</a> for more details.')
+]
 
 
 def init():
@@ -31,3 +46,8 @@ def init():
     menu = cfg.main_menu.get('system:index')
     menu.add_urlname(_('Monkeysphere'), 'glyphicon-certificate',
                      'monkeysphere:index', 970)
+
+
+def setup(helper, old_version=None):
+    """Install and configure the module."""
+    helper.install(['monkeysphere'])
diff --git a/plinth/modules/monkeysphere/templates/monkeysphere.html b/plinth/modules/monkeysphere/templates/monkeysphere.html
index 2e67c5204..ebe048590 100644
--- a/plinth/modules/monkeysphere/templates/monkeysphere.html
+++ b/plinth/modules/monkeysphere/templates/monkeysphere.html
@@ -1,4 +1,4 @@
-{% extends "base.html" %}
+{% extends "app.html" %}
 {% comment %}
 #
 # This file is part of Plinth.
@@ -30,22 +30,7 @@
 {% endblock %}
 
 
-{% block content %}
-
-  <h2>{% trans "Monkeysphere" %}</h2>
-
-  <p>
-    {% blocktrans trimmed %}
-      With Monkeysphere, a PGP key can be generated for each configured domain
-      serving SSH. The PGP public key can then be uploaded to the PGP
-      keyservers. Users connecting to this machine through SSH can verify that
-      they are connecting to the correct host.  For users to trust the key, at
-      least one person (usually the machine owner) must sign the key using the
-      regular PGP key signing process.  See the
-      <a href="http://web.monkeysphere.info/getting-started-ssh/">
-      Monkeysphere SSH documentation</a> for more details.
-    {% endblocktrans %}
-  </p>
+{% block configuration %}
 
   {% if running %}
     <p class="running-status-parent">
diff --git a/plinth/modules/monkeysphere/views.py b/plinth/modules/monkeysphere/views.py
index 777c64b25..2ce31d22d 100644
--- a/plinth/modules/monkeysphere/views.py
+++ b/plinth/modules/monkeysphere/views.py
@@ -28,20 +28,20 @@ from django.views.decorators.http import require_POST
 import json
 
 from plinth import actions
-from plinth import package
+from plinth.modules import monkeysphere
 from plinth.modules import names
 
 publish_process = None
 
 
-@package.required(['monkeysphere'])
 def index(request):
     """Serve configuration page."""
     _collect_publish_result(request)
     status = get_status()
     return TemplateResponse(
         request, 'monkeysphere.html',
-        {'title': _('Monkeysphere'),
+        {'title': monkeysphere.title,
+         'description': monkeysphere.description,
          'status': status,
          'running': bool(publish_process)})
 
diff --git a/plinth/modules/mumble/__init__.py b/plinth/modules/mumble/__init__.py
index 570a57cc8..b7f772494 100644
--- a/plinth/modules/mumble/__init__.py
+++ b/plinth/modules/mumble/__init__.py
@@ -21,13 +21,25 @@ Plinth module to configure Mumble server
 
 from django.utils.translation import ugettext_lazy as _
 
-from plinth import actions
 from plinth import action_utils
 from plinth import cfg
 from plinth import service as service_module
 
 
-depends = ['plinth.modules.apps']
+version = 1
+
+depends = ['apps']
+
+title = _('Voice Chat (Mumble)')
+
+description = [
+    _('Mumble is an open source, low-latency, encrypted, high quality '
+      'voice chat software.'),
+
+    _('You can connect to your Mumble server on the regular Mumble port '
+      '64738. <a href="http://mumble.info">Clients</a> to connect to Mumble '
+      'from your desktop and Android devices are available.')
+]
 
 service = None
 
@@ -35,13 +47,17 @@ service = None
 def init():
     """Intialize the Mumble module."""
     menu = cfg.main_menu.get('apps:index')
-    menu.add_urlname(_('Voice Chat (Mumble)'), 'glyphicon-headphones',
-                     'mumble:index', 900)
+    menu.add_urlname(title, 'glyphicon-headphones', 'mumble:index', 900)
 
     global service
     service = service_module.Service(
-        'mumble-plinth', _('Mumble Voice Chat Server'),
-        is_external=True, enabled=is_enabled())
+        'mumble-plinth', title, is_external=True, enabled=is_enabled())
+
+
+def setup(helper, old_version=None):
+    """Install and configure the module."""
+    helper.install(['mumble-server'])
+    helper.call('post', service.notify_enabled, None, True)
 
 
 def is_enabled():
diff --git a/plinth/modules/mumble/templates/mumble.html b/plinth/modules/mumble/templates/mumble.html
index 8f9d1d725..96745dfd8 100644
--- a/plinth/modules/mumble/templates/mumble.html
+++ b/plinth/modules/mumble/templates/mumble.html
@@ -1,4 +1,4 @@
-{% extends "base.html" %}
+{% extends "app.html" %}
 {% comment %}
 #
 # This file is part of Plinth.
@@ -21,25 +21,7 @@
 {% load bootstrap %}
 {% load i18n %}
 
-{% block content %}
-
-  <h2>{% trans "Voice Chat (Mumble)" %}</h2>
-
-  <p>
-    {% blocktrans trimmed %}
-      Mumble is an open source, low-latency, encrypted, high quality
-      voice chat software.
-    {% endblocktrans %}
-  </p>
-
-  <p>
-    {% blocktrans trimmed %}
-      You can connect to your Mumble server on the regular Mumble port 64738.
-      <a href="http://mumble.info">Clients</a> to connect to Mumble
-      from your desktop and Android devices are available.
-    {% endblocktrans %}
-  </p>
-
+{% block configuration %}
 
   <h3>{% trans "Status" %}</h3>
 
diff --git a/plinth/modules/mumble/views.py b/plinth/modules/mumble/views.py
index 3ecadd7cc..4d67f6458 100644
--- a/plinth/modules/mumble/views.py
+++ b/plinth/modules/mumble/views.py
@@ -26,18 +26,11 @@ import logging
 
 from .forms import MumbleForm
 from plinth import actions
-from plinth import package
 from plinth.modules import mumble
 
 logger = logging.getLogger(__name__)
 
 
-def on_install():
-    """Notify that the service is now enabled."""
-    mumble.service.notify_enabled(None, True)
-
-
-@package.required(['mumble-server'], on_install=on_install)
 def index(request):
     """Serve configuration page."""
     status = get_status()
@@ -55,7 +48,8 @@ def index(request):
         form = MumbleForm(initial=status, prefix='mumble')
 
     return TemplateResponse(request, 'mumble.html',
-                            {'title': _('Voice Chat (Mumble)'),
+                            {'title': mumble.title,
+                             'description': mumble.description,
                              'status': status,
                              'form': form})
 
diff --git a/plinth/modules/names/__init__.py b/plinth/modules/names/__init__.py
index 841b95f7f..d2c5e9565 100644
--- a/plinth/modules/names/__init__.py
+++ b/plinth/modules/names/__init__.py
@@ -31,7 +31,13 @@ SERVICES = (
     ('ssh', _('SSH'), 22),
 )
 
-depends = ['plinth.modules.system']
+version = 1
+
+is_essential = True
+
+depends = ['system']
+
+title = _('Name Services')
 
 domain_types = {}
 domains = {}
@@ -42,8 +48,7 @@ logger = logging.getLogger(__name__)
 def init():
     """Initialize the names module."""
     menu = cfg.main_menu.get('system:index')
-    menu.add_urlname(_('Name Services'), 'glyphicon-tag',
-                     'names:index', 19)
+    menu.add_urlname(title, 'glyphicon-tag', 'names:index', 19)
 
     domain_added.connect(on_domain_added)
     domain_removed.connect(on_domain_removed)
@@ -54,6 +59,7 @@ def on_domain_added(sender, domain_type, name='', description='',
     """Add domain to global list."""
     if not domain_type:
         return
+
     domain_types[domain_type] = description
 
     if not name:
diff --git a/plinth/modules/names/templates/names.html b/plinth/modules/names/templates/names.html
index fffc51897..bbdc0107b 100644
--- a/plinth/modules/names/templates/names.html
+++ b/plinth/modules/names/templates/names.html
@@ -1,4 +1,4 @@
-{% extends "base.html" %}
+{% extends "app.html" %}
 {% comment %}
 #
 # This file is part of Plinth.
@@ -21,9 +21,7 @@
 {% load bootstrap %}
 {% load i18n %}
 
-{% block content %}
-
-<h2>{{ title }}</h2>
+{% block configuration %}
 
 <div class="row">
   <div class="col-sm-5">
diff --git a/plinth/modules/names/views.py b/plinth/modules/names/views.py
index c95ea0b00..d8daecd1f 100644
--- a/plinth/modules/names/views.py
+++ b/plinth/modules/names/views.py
@@ -24,6 +24,7 @@ from django.utils.translation import ugettext as _
 
 from . import SERVICES, get_domain_types, get_description
 from . import get_domain, get_services_status
+from plinth.modules import names
 
 
 def index(request):
@@ -31,7 +32,7 @@ def index(request):
     status = get_status()
 
     return TemplateResponse(request, 'names.html',
-                            {'title': _('Name Services'),
+                            {'title': names.title,
                              'status': status})
 
 
diff --git a/plinth/modules/networks/__init__.py b/plinth/modules/networks/__init__.py
index a3a679823..d72425a19 100644
--- a/plinth/modules/networks/__init__.py
+++ b/plinth/modules/networks/__init__.py
@@ -19,23 +19,37 @@
 Plinth module to interface with network-manager
 """
 
-from django.utils.translation import ugettext as _
+from django.utils.translation import ugettext_lazy as _
 from logging import Logger
 import subprocess
 
-from . import networks
-from .networks import init
 from plinth import action_utils
+from plinth import cfg
 from plinth import network
 
 
-__all__ = ['networks', 'init']
+version = 1
 
-depends = ['plinth.modules.system']
+is_essential = True
+
+depends = ['system']
+
+title = _('Networks')
 
 logger = Logger(__name__)
 
 
+def init():
+    """Initialize the Networks module."""
+    menu = cfg.main_menu.get('system:index')
+    menu.add_urlname(title, 'glyphicon-signal', 'networks:index', 18)
+
+
+def setup(helper, old_version=None):
+    """Install and configure the module."""
+    helper.install(['network-manager'])
+
+
 def diagnose():
     """Run diagnostics and return the results."""
     results = []
@@ -44,8 +58,10 @@ def diagnose():
     addresses = _get_interface_addresses(interfaces)
 
     for address in addresses:
-        results.append(action_utils.diagnose_port_listening(53, 'tcp', address))
-        results.append(action_utils.diagnose_port_listening(53, 'udp', address))
+        results.append(
+            action_utils.diagnose_port_listening(53, 'tcp', address))
+        results.append(
+            action_utils.diagnose_port_listening(53, 'udp', address))
 
     results.append(_diagnose_dnssec('4'))
     results.append(_diagnose_dnssec('6'))
diff --git a/plinth/modules/networks/networks.py b/plinth/modules/networks/networks.py
index 88034ee9f..522b08aa1 100644
--- a/plinth/modules/networks/networks.py
+++ b/plinth/modules/networks/networks.py
@@ -25,9 +25,7 @@ from logging import Logger
 
 from .forms import (ConnectionTypeSelectForm, EthernetForm, PPPoEForm,
                     WifiForm)
-from plinth import cfg
 from plinth import network
-from plinth import package
 
 
 logger = Logger(__name__)
@@ -40,14 +38,6 @@ subsubmenu = [{'url': reverse_lazy('networks:index'),
                'text': ugettext_lazy('Add Connection')}]
 
 
-def init():
-    """Initialize the Networks module."""
-    menu = cfg.main_menu.get('system:index')
-    menu.add_urlname(ugettext_lazy('Networks'), 'glyphicon-signal',
-                     'networks:index', 18)
-
-
-@package.required(['network-manager'])
 def index(request):
     """Show connection list."""
     connections = network.get_connection_list()
diff --git a/plinth/modules/openvpn/__init__.py b/plinth/modules/openvpn/__init__.py
index 20be7aabe..c035abb99 100644
--- a/plinth/modules/openvpn/__init__.py
+++ b/plinth/modules/openvpn/__init__.py
@@ -25,9 +25,25 @@ from plinth import actions
 from plinth import action_utils
 from plinth import cfg
 from plinth import service as service_module
+from plinth.utils import format_lazy
 
 
-depends = ['plinth.modules.apps']
+version = 1
+
+depends = ['apps']
+
+title = _('Virtual Private Network (OpenVPN)')
+
+description = [
+    format_lazy(
+        _('Virtual Private Network (VPN) is a technique for securely '
+          'connecting two devices in order to access resources of a '
+          'private network.  While you are away from home, you can connect '
+          'to your {box_name} in order to join your home network and '
+          'access private/internal services provided by {box_name}. '
+          'You can also access the rest of the Internet via {box_name} '
+          'for added security and anonymity.'), box_name=_(cfg.box_name))
+]
 
 service = None
 
@@ -35,13 +51,16 @@ service = None
 def init():
     """Intialize the OpenVPN module."""
     menu = cfg.main_menu.get('apps:index')
-    menu.add_urlname(_('Virtual Private Network (OpenVPN)'), 'glyphicon-lock',
-                     'openvpn:index', 850)
+    menu.add_urlname(title, 'glyphicon-lock', 'openvpn:index', 850)
 
     global service
     service = service_module.Service(
-        'openvpn', _('OpenVPN'), ['openvpn'],
-        is_external=True, enabled=is_enabled())
+        'openvpn', title, ['openvpn'], is_external=True, enabled=is_enabled())
+
+
+def setup(helper, old_version=None):
+    """Install and configure the module."""
+    helper.install(['openvpn', 'easy-rsa'])
 
 
 def is_enabled():
diff --git a/plinth/modules/openvpn/templates/openvpn.html b/plinth/modules/openvpn/templates/openvpn.html
index d2ff0c5d8..422a9e69f 100644
--- a/plinth/modules/openvpn/templates/openvpn.html
+++ b/plinth/modules/openvpn/templates/openvpn.html
@@ -1,4 +1,4 @@
-{% extends "base.html" %}
+{% extends "app.html" %}
 {% comment %}
 #
 # This file is part of Plinth.
@@ -30,21 +30,7 @@
 {% endblock %}
 
 
-{% block content %}
-
-  <h2>{% trans "Virtual Private Network (OpenVPN)" %}</h2>
-
-  <p>
-    {% blocktrans trimmed %}
-      Virtual Private Network (VPN) is a technique for securely
-      connecting two devices in order to access resources of a
-      private network.  While you are away from home, you can connect
-      to your {{ box_name }} in order to join your home network and
-      access private/internal services provided by {{ box_name }}.
-      You can also access the rest of the Internet via {{ box_name }}
-      for added security and anonymity.
-    {% endblocktrans %}
-  </p>
+{% block configuration %}
 
   {% if status.is_setup %}
 
diff --git a/plinth/modules/openvpn/views.py b/plinth/modules/openvpn/views.py
index f4cd85ed8..ea1c6aefa 100644
--- a/plinth/modules/openvpn/views.py
+++ b/plinth/modules/openvpn/views.py
@@ -29,7 +29,6 @@ import logging
 
 from .forms import OpenVpnForm
 from plinth import actions
-from plinth import package
 from plinth.modules import openvpn
 from plinth.modules.config import config
 
@@ -38,7 +37,6 @@ logger = logging.getLogger(__name__)
 setup_process = None
 
 
-@package.required(['openvpn', 'easy-rsa'])
 def index(request):
     """Serve configuration page."""
     status = get_status()
@@ -59,7 +57,8 @@ def index(request):
         form = OpenVpnForm(initial=status, prefix='openvpn')
 
     return TemplateResponse(request, 'openvpn.html',
-                            {'title': _('Virtual Private Network (OpenVPN)'),
+                            {'title': openvpn.title,
+                             'description': openvpn.description,
                              'status': status,
                              'form': form})
 
diff --git a/plinth/modules/owncloud/__init__.py b/plinth/modules/owncloud/__init__.py
index e48fcae2d..c5fbdd59a 100644
--- a/plinth/modules/owncloud/__init__.py
+++ b/plinth/modules/owncloud/__init__.py
@@ -19,14 +19,60 @@
 Plinth module to configure ownCloud
 """
 
-from . import owncloud
-from .owncloud import init
+from django.utils.translation import ugettext_lazy as _
 
+from plinth import actions
 from plinth import action_utils
+from plinth import cfg
+from plinth import service as service_module
 
-__all__ = ['owncloud', 'init']
+version = 1
 
-depends = ['plinth.modules.apps']
+depends = ['apps']
+
+title = _('File Hosting (ownCloud)')
+
+description = [
+    _('ownCloud gives you universal access to your files through a web '
+      'interface or WebDAV. It also provides a platform to easily view '
+      '& sync your contacts, calendars and bookmarks across all your '
+      'devices and enables basic editing right on the web. Installation '
+      'has minimal server requirements, doesn\'t need special '
+      'permissions and is quick. ownCloud is extendable via a simple '
+      'but powerful API for applications and plugins.'),
+
+    _('When enabled, the ownCloud installation will be available '
+      'from <a href="/owncloud">/owncloud</a> path on the web server. '
+      'Visit this URL to set up the initial administration account for '
+      'ownCloud.')
+]
+
+service = None
+
+
+def init():
+    """Initialize the ownCloud module"""
+    menu = cfg.main_menu.get('apps:index')
+    menu.add_urlname(title, 'glyphicon-picture', 'owncloud:index', 700)
+
+    global service
+    service = service_module.Service(
+        'owncloud', title, ['http', 'https'], is_external=True,
+        enabled=is_enabled())
+
+
+def setup(helper, old_version=None):
+    """Install and configure the module."""
+    helper.install(['postgresql', 'php5-pgsql', 'owncloud', 'php-dropbox',
+                    'php-google-api-php-client'])
+    helper.call('post', actions.superuser_run, 'owncloud-setup', ['enable'])
+    helper.call('post', service.notify_enabled, None, True)
+
+
+def is_enabled():
+    """Return whether the module is enabled."""
+    output = actions.run('owncloud-setup', ['status'])
+    return 'enable' in output.split()
 
 
 def diagnose():
diff --git a/plinth/modules/owncloud/forms.py b/plinth/modules/owncloud/forms.py
new file mode 100644
index 000000000..3ea4c6f8c
--- /dev/null
+++ b/plinth/modules/owncloud/forms.py
@@ -0,0 +1,30 @@
+#
+# This file is part of Plinth.
+#
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU Affero General Public License as
+# published by the Free Software Foundation, either version 3 of the
+# License, or (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU Affero General Public License for more details.
+#
+# You should have received a copy of the GNU Affero General Public License
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+#
+
+"""
+Forms for configuring ownCloud.
+"""
+
+from django import forms
+from django.utils.translation import ugettext_lazy as _
+
+
+class OwnCloudForm(forms.Form):  # pylint: disable-msg=W0232
+    """ownCloud configuration form"""
+    enabled = forms.BooleanField(
+        label=_('Enable ownCloud'),
+        required=False)
diff --git a/plinth/modules/owncloud/templates/owncloud.html b/plinth/modules/owncloud/templates/owncloud.html
index 410071f08..266967d3d 100644
--- a/plinth/modules/owncloud/templates/owncloud.html
+++ b/plinth/modules/owncloud/templates/owncloud.html
@@ -1,4 +1,4 @@
-{% extends "base.html" %}
+{% extends "app.html" %}
 {% comment %}
 #
 # This file is part of Plinth.
@@ -21,30 +21,7 @@
 {% load bootstrap %}
 {% load i18n %}
 
-{% block content %}
-
-  <h2>{% trans "File Hosting (ownCloud)" %}</h2>
-
-  <p>
-    {% blocktrans trimmed %}
-      ownCloud gives you universal access to your files through a web
-      interface or WebDAV. It also provides a platform to easily view
-      & sync your contacts, calendars and bookmarks across all your
-      devices and enables basic editing right on the web. Installation
-      has minimal server requirements, doesn't need special
-      permissions and is quick. ownCloud is extendable via a simple
-      but powerful API for applications and plugins.
-    {% endblocktrans %}
-  </p>
-
-  <p>
-    {% blocktrans trimmed %}
-      When enabled, the ownCloud installation will be available
-      from <a href="/owncloud">/owncloud</a> path on the web server.
-      Visit this URL to set up the initial administration account for
-      ownCloud.
-    {% endblocktrans %}
-  </p>
+{% block configuration %}
 
   {% include "diagnostics_button.html" with module="owncloud" %}
 
diff --git a/plinth/modules/owncloud/urls.py b/plinth/modules/owncloud/urls.py
index d69ac14ef..338ad6cc5 100644
--- a/plinth/modules/owncloud/urls.py
+++ b/plinth/modules/owncloud/urls.py
@@ -21,7 +21,7 @@ URLs for the ownCloud module
 
 from django.conf.urls import url
 
-from . import owncloud as views
+from . import views
 
 
 urlpatterns = [
diff --git a/plinth/modules/owncloud/owncloud.py b/plinth/modules/owncloud/views.py
similarity index 62%
rename from plinth/modules/owncloud/owncloud.py
rename to plinth/modules/owncloud/views.py
index f510965d6..b2e77077b 100644
--- a/plinth/modules/owncloud/owncloud.py
+++ b/plinth/modules/owncloud/views.py
@@ -19,47 +19,15 @@
 Plinth module for configuring ownCloud.
 """
 
-from django import forms
 from django.contrib import messages
 from django.template.response import TemplateResponse
 from django.utils.translation import ugettext_lazy as _
 
+from .forms import OwnCloudForm
 from plinth import actions
-from plinth import cfg
-from plinth import package
-from plinth import service as service_module
+from plinth.modules import owncloud
 
 
-service = None
-
-
-class OwnCloudForm(forms.Form):  # pylint: disable-msg=W0232
-    """ownCloud configuration form"""
-    enabled = forms.BooleanField(label=_('Enable ownCloud'), required=False)
-
-
-def init():
-    """Initialize the ownCloud module"""
-    menu = cfg.main_menu.get('apps:index')
-    menu.add_urlname(_('File Hosting (ownCloud)'), 'glyphicon-picture',
-                     'owncloud:index', 700)
-
-    status = get_status()
-
-    global service  # pylint: disable-msg=W0603
-    service = service_module.Service(
-        'owncloud', _('ownCloud'), ['http', 'https'], is_external=True,
-        enabled=status['enabled'])
-
-
-def on_install():
-    """Tasks to run after package install."""
-    actions.superuser_run('owncloud-setup', ['enable'])
-    service.notify_enabled(None, True)
-
-
-@package.required(['postgresql', 'php5-pgsql', 'owncloud', 'php-dropbox',
-                   'php-google-api-php-client'], on_install=on_install)
 def index(request):
     """Serve the ownCloud configuration page"""
     status = get_status()
@@ -77,14 +45,14 @@ def index(request):
         form = OwnCloudForm(initial=status, prefix='owncloud')
 
     return TemplateResponse(request, 'owncloud.html',
-                            {'title': _('ownCloud'),
+                            {'title': owncloud.title,
+                             'description': owncloud.description,
                              'form': form})
 
 
 def get_status():
     """Return the current status"""
-    output = actions.run('owncloud-setup', ['status'])
-    return {'enabled': 'enable' in output.split()}
+    return {'enabled': owncloud.is_enabled()}
 
 
 def _apply_changes(request, old_status, new_status):
@@ -104,4 +72,4 @@ def _apply_changes(request, old_status, new_status):
 
     # Send a signal to other modules that the service is
     # enabled/disabled
-    service.notify_enabled(None, new_status['enabled'])
+    owncloud.service.notify_enabled(None, new_status['enabled'])
diff --git a/plinth/modules/pagekite/__init__.py b/plinth/modules/pagekite/__init__.py
index b83c7e5ae..6862c1b68 100644
--- a/plinth/modules/pagekite/__init__.py
+++ b/plinth/modules/pagekite/__init__.py
@@ -21,19 +21,59 @@ Plinth module to configure PageKite
 
 from django.utils.translation import ugettext_lazy as _
 from plinth import cfg
+from plinth.utils import format_lazy
 
 from . import utils
 
-__all__ = ['init']
+version = 1
 
-depends = ['plinth.modules.apps', 'plinth.modules.names']
+depends = ['apps', 'names']
+
+title = _('Public Visibility (PageKite)')
+
+description = [
+    format_lazy(
+        _('PageKite is a system for exposing {box_name} services when '
+          'you don\'t have a direct connection to the Internet. You only '
+          'need this if your {box_name} services are unreachable from '
+          'the rest of the Internet. This includes the following '
+          'situations:'), box_name=_(cfg.box_name)),
+
+    format_lazy(
+        _('{box_name} is behind a restricted firewall.'),
+        box_name=_(cfg.box_name)),
+
+    format_lazy(
+        _('{box_name} is connected to a (wireless) router which you '
+          'don\'t control.'), box_name=_(cfg.box_name)),
+
+    _('Your ISP does not provide you an external IP address and '
+      'instead provides Internet connection through NAT.'),
+
+    _('Your ISP does not provide you a static IP address and your IP '
+      'address changes evertime you connect to Internet.'),
+
+    _('Your ISP limits incoming connections.'),
+
+    format_lazy(
+        _('PageKite works around NAT, firewalls and IP-address limitations '
+          'by using a combination of tunnels and reverse proxies. You can '
+          'use any pagekite service provider, for example '
+          '<a href="https://pagekite.net">pagekite.net</a>.  In future it '
+          'might be possible to use your buddy\'s {box_name} for this.'),
+        box_name=_(cfg.box_name))
+]
 
 
 def init():
     """Intialize the PageKite module"""
     menu = cfg.main_menu.get('apps:index')
-    menu.add_urlname(_('Public Visibility (PageKite)'),
-                     'glyphicon-flag', 'pagekite:index', 800)
+    menu.add_urlname(title, 'glyphicon-flag', 'pagekite:index', 800)
 
     # Register kite name with Name Services module.
     utils.update_names_module(initial_registration=True)
+
+
+def setup(helper, old_version=None):
+    """Install and configure the module."""
+    helper.install(['pagekite'])
diff --git a/plinth/modules/pagekite/templates/pagekite_introduction.html b/plinth/modules/pagekite/templates/pagekite_introduction.html
index 92682064d..0961c1923 100644
--- a/plinth/modules/pagekite/templates/pagekite_introduction.html
+++ b/plinth/modules/pagekite/templates/pagekite_introduction.html
@@ -1,4 +1,4 @@
-{% extends "base.html" %}
+{% extends "app.html" %}
 {% comment %}
 #
 # This file is part of Plinth.
@@ -20,58 +20,7 @@
 
 {% load i18n %}
 
-{% block content %}
-
-  <p>
-    {% blocktrans trimmed %}
-      PageKite is a system for exposing {{ box_name }} services when
-      you don't have a direct connection to the Internet. You only
-      need this if your {{ box_name }} services are unreachable from
-      the rest of the Internet. This includes the following
-      situations:
-    {% endblocktrans %}
-  </p>
-
-  <ul>
-    <li>
-      {% blocktrans trimmed %}
-        {{ box_name }} is behind a restricted firewall.
-      {% endblocktrans %}
-    </li>
-
-    <li>
-      {% blocktrans trimmed %}
-        {{ box_name }} is connected to a (wireless) router which you
-        don't control.
-      {% endblocktrans %}
-    </li>
-
-    <li>
-      {% blocktrans trimmed %}
-        Your ISP does not provide you an external IP address and
-        instead provides Internet connection through NAT.
-      {% endblocktrans %}
-    </li>
-
-    <li>
-      {% blocktrans trimmed %}
-        Your ISP does not provide you a static IP address and your IP
-        address changes evertime you connect to Internet.
-      {% endblocktrans %}
-    </li>
-
-    <li>{% trans "Your ISP limits incoming connections." %}</li>
-  </ul>
-
-  <p>
-    {% blocktrans trimmed %}
-      PageKite works around NAT, firewalls and IP-address limitations
-      by using a combination of tunnels and reverse proxies. You can
-      use any pagekite service provider, for example
-      <a href="https://pagekite.net">pagekite.net</a>.  In future it
-      might be possible to use your buddy's {{ box_name }} for this.
-    {% endblocktrans %}
-  </p>
+{% block configuration %}
 
   <p>
     <a class="btn btn-primary btn-md" href="{% url 'pagekite:configure' %}">
diff --git a/plinth/modules/pagekite/views.py b/plinth/modules/pagekite/views.py
index 99fe0fd46..583f072dc 100644
--- a/plinth/modules/pagekite/views.py
+++ b/plinth/modules/pagekite/views.py
@@ -18,18 +18,16 @@
 from django.core.urlresolvers import reverse, reverse_lazy
 from django.http.response import HttpResponseRedirect
 from django.template.response import TemplateResponse
-from django.utils.decorators import method_decorator
 from django.utils.translation import ugettext_lazy as _
 from django.views.generic import View, TemplateView
 from django.views.generic.edit import FormView
 
-from plinth import package
 from . import utils
 from .forms import ConfigurationForm, StandardServiceForm, \
     AddCustomServiceForm, DeleteCustomServiceForm
+from plinth.modules import pagekite
 
 
-required_packages = ('pagekite',)
 subsubmenu = [{'url': reverse_lazy('pagekite:index'),
                'text': _('About PageKite')},
               {'url': reverse_lazy('pagekite:configure'),
@@ -43,7 +41,8 @@ subsubmenu = [{'url': reverse_lazy('pagekite:index'),
 def index(request):
     """Serve introduction page"""
     return TemplateResponse(request, 'pagekite_introduction.html',
-                            {'title': _('Public Visibility (PageKite)'),
+                            {'title': pagekite.title,
+                             'description': pagekite.description,
                              'subsubmenu': subsubmenu})
 
 
@@ -59,7 +58,6 @@ class ContextMixin(object):
         context['subsubmenu'] = subsubmenu
         return context
 
-    @method_decorator(package.required(required_packages))
     def dispatch(self, *args, **kwargs):
         return super(ContextMixin, self).dispatch(*args, **kwargs)
 
@@ -81,8 +79,9 @@ class CustomServiceView(ContextMixin, TemplateView):
         unused, custom_services = utils.get_pagekite_services()
         for service in custom_services:
             service['form'] = AddCustomServiceForm(initial=service)
-        context['custom_services'] = [utils.prepare_service_for_display(service)
-                                      for service in custom_services]
+        context['custom_services'] = [
+            utils.prepare_service_for_display(service)
+            for service in custom_services]
         context.update(utils.get_kite_details())
         return context
 
diff --git a/plinth/modules/power/__init__.py b/plinth/modules/power/__init__.py
index f8f4c4e56..9cf5d0aef 100644
--- a/plinth/modules/power/__init__.py
+++ b/plinth/modules/power/__init__.py
@@ -23,11 +23,20 @@ from django.utils.translation import ugettext_lazy as _
 
 from plinth import cfg
 
-depends = ['plinth.modules.system']
+version = 1
+
+is_essential = True
+
+depends = ['system']
+
+title = _('Power')
+
+description = [
+    _('Restart or shut down the system.')
+]
 
 
 def init():
     """Initialize the power module."""
     menu = cfg.main_menu.get('system:index')
-    menu.add_urlname(_('Power'), 'glyphicon-off',
-                     'power:index', 1000)
+    menu.add_urlname(title, 'glyphicon-off', 'power:index', 1000)
diff --git a/plinth/modules/power/templates/power.html b/plinth/modules/power/templates/power.html
index 642aea911..89553d389 100644
--- a/plinth/modules/power/templates/power.html
+++ b/plinth/modules/power/templates/power.html
@@ -1,4 +1,4 @@
-{% extends "base.html" %}
+{% extends "app.html" %}
 {% comment %}
 #
 # This file is part of Plinth.
@@ -21,13 +21,7 @@
 {% load bootstrap %}
 {% load i18n %}
 
-{% block content %}
-
-  <h2>{{ title }}</h2>
-
-  <p>
-    {% blocktrans trimmed %}Restart or shut down the system.{% endblocktrans %}
-  </p>
+{% block configuration %}
 
   <p>
     <a class="btn btn-default btn-md" href="{% url 'power:restart' %}">
diff --git a/plinth/modules/power/views.py b/plinth/modules/power/views.py
index e1d835f6a..ae18d4506 100644
--- a/plinth/modules/power/views.py
+++ b/plinth/modules/power/views.py
@@ -26,11 +26,14 @@ from django.template.response import TemplateResponse
 from django.utils.translation import ugettext as _
 
 from plinth import actions
+from plinth.modules import power
 
 
 def index(request):
     """Serve power controls page."""
-    return TemplateResponse(request, 'power.html', {'title': _('Power')})
+    return TemplateResponse(request, 'power.html',
+                            {'title': power.title,
+                             'description': power.description})
 
 
 def restart(request):
diff --git a/plinth/modules/privoxy/__init__.py b/plinth/modules/privoxy/__init__.py
index 545020a0f..eaf0d20d1 100644
--- a/plinth/modules/privoxy/__init__.py
+++ b/plinth/modules/privoxy/__init__.py
@@ -20,15 +20,36 @@ Plinth module to configure Privoxy.
 """
 
 from django.utils.translation import ugettext_lazy as _
-import json
 
 from plinth import actions
 from plinth import action_utils
 from plinth import cfg
 from plinth import service as service_module
+from plinth.utils import format_lazy
 
 
-depends = ['plinth.modules.apps']
+version = 1
+
+is_essential = False
+
+depends = ['apps']
+
+title = _('Web Proxy (Privoxy)')
+
+description = [
+    _('Privoxy is a non-caching web proxy with advanced filtering '
+      'capabilities for enhancing privacy, modifying web page data and '
+      'HTTP headers, controlling access, and removing ads and other '
+      'obnoxious Internet junk. '),
+
+    format_lazy(
+        _('You can use Privoxy by modifying your browser proxy settings to '
+          'your {box_name} hostname (or IP address) with port 8118. '
+          'While using Privoxy, you can see its configuration details and '
+          'documentation at '
+          '<a href="http://config.privoxy.org">http://config.privoxy.org/</a> '
+          'or <a href="http://p.p">http://p.p</a>.'), box_name=_(cfg.box_name))
+]
 
 service = None
 
@@ -36,13 +57,18 @@ service = None
 def init():
     """Intialize the module."""
     menu = cfg.main_menu.get('apps:index')
-    menu.add_urlname(_('Web Proxy (Privoxy)'), 'glyphicon-cloud-upload',
-                     'privoxy:index', 1000)
+    menu.add_urlname(title, 'glyphicon-cloud-upload', 'privoxy:index', 1000)
 
     global service
     service = service_module.Service(
-        'privoxy', _('Privoxy Web Proxy'),
-        is_external=False, enabled=is_enabled())
+        'privoxy', title, is_external=False, enabled=is_enabled())
+
+
+def setup(helper, old_version=None):
+    """Install and configure the module."""
+    helper.install(['privoxy'])
+    helper.call('post', actions.superuser_run, 'privoxy', ['setup'])
+    helper.call('post', service.notify_enabled, None, True)
 
 
 def is_enabled():
@@ -84,9 +110,7 @@ def diagnose_url_with_proxy():
 
         result = action_utils.diagnose_url(url, kind=address['kind'], env=env)
         result[0] = _('Access {url} with proxy {proxy} on tcp{kind}') \
-                    .format(url=url, proxy=proxy, kind=address['kind'])
+            .format(url=url, proxy=proxy, kind=address['kind'])
         results.append(result)
 
     return results
-
-
diff --git a/plinth/modules/privoxy/templates/privoxy.html b/plinth/modules/privoxy/templates/privoxy.html
index 4a4f82c00..d80099eb4 100644
--- a/plinth/modules/privoxy/templates/privoxy.html
+++ b/plinth/modules/privoxy/templates/privoxy.html
@@ -1,4 +1,4 @@
-{% extends "base.html" %}
+{% extends "app.html" %}
 {% comment %}
 #
 # This file is part of Plinth.
@@ -21,29 +21,7 @@
 {% load bootstrap %}
 {% load i18n %}
 
-{% block content %}
-
-  <h2>{% trans "Web Proxy (Privoxy)" %}</h2>
-
-  <p>
-    {% blocktrans trimmed %}
-      Privoxy is a non-caching web proxy with advanced filtering
-      capabilities for enhancing privacy, modifying web page data and
-      HTTP headers, controlling access, and removing ads and other
-      obnoxious Internet junk.
-    {% endblocktrans %}
-  </p>
-
-  <p>
-    {% blocktrans trimmed %}
-      You can use Privoxy by modifying your browser proxy settings to
-      your {{ box_name }} hostname (or IP address) with port 8118.
-      While using Privoxy, you can see its configuration details and
-      documentation at
-      <a href="http://config.privoxy.org">http://config.privoxy.org/</a>
-      or <a href="http://p.p">http://p.p</a>.
-    {% endblocktrans %}
-  </p>
+{% block configuration %}
 
   <h3>{% trans "Status" %}</h3>
 
diff --git a/plinth/modules/privoxy/views.py b/plinth/modules/privoxy/views.py
index 47bb844c7..853f8709f 100644
--- a/plinth/modules/privoxy/views.py
+++ b/plinth/modules/privoxy/views.py
@@ -26,19 +26,11 @@ import logging
 
 from .forms import PrivoxyForm
 from plinth import actions
-from plinth import package
 from plinth.modules import privoxy
 
 logger = logging.getLogger(__name__)
 
 
-def on_install():
-    """Notify that the service is now enabled."""
-    actions.superuser_run('privoxy', ['setup'])
-    privoxy.service.notify_enabled(None, True)
-
-
-@package.required(['privoxy'], on_install=on_install)
 def index(request):
     """Serve configuration page."""
     status = get_status()
@@ -56,7 +48,8 @@ def index(request):
         form = PrivoxyForm(initial=status, prefix='privoxy')
 
     return TemplateResponse(request, 'privoxy.html',
-                            {'title': _('Web Proxy (Privoxy)'),
+                            {'title': privoxy.title,
+                             'description': privoxy.description,
                              'status': status,
                              'form': form})
 
diff --git a/plinth/modules/quassel/__init__.py b/plinth/modules/quassel/__init__.py
index 3e8c1b03a..c30f0abcc 100644
--- a/plinth/modules/quassel/__init__.py
+++ b/plinth/modules/quassel/__init__.py
@@ -16,7 +16,7 @@
 #
 
 """
-Plinth module for quassel.
+Plinth module for Quassel.
 """
 
 from django.utils.translation import ugettext_lazy as _
@@ -24,8 +24,30 @@ from django.utils.translation import ugettext_lazy as _
 from plinth import action_utils
 from plinth import cfg
 from plinth import service as service_module
+from plinth.utils import format_lazy
 
-depends = ['plinth.modules.apps']
+version = 1
+
+depends = ['apps']
+
+title = _('IRC Client (Quassel)')
+
+description = [
+    format_lazy(
+        _('Quassel is an IRC application that is split into two parts, a '
+          '"core" and a "client". This allows the core to remain connected '
+          'to IRC servers, and to continue receiving messages, even when '
+          'the client is disconnected. {box_name} can run the Quassel '
+          'core service keeping you always online and one or more Quassel '
+          'clients from a desktop or a mobile can be used to connect and '
+          'disconnect from it.'), box_name=_(cfg.box_name)),
+
+    _('You can connect to your Quassel core on the default Quassel port '
+      '4242.  Clients to connect to Quassel from your '
+      '<a href="http://quassel-irc.org/downloads">desktop</a> and '
+      '<a href="http://quasseldroid.iskrembilen.com/">mobile</a> devices '
+      'are available.')
+]
 
 service = None
 
@@ -33,13 +55,17 @@ service = None
 def init():
     """Initialize the quassel module."""
     menu = cfg.main_menu.get('apps:index')
-    menu.add_urlname(_('IRC Client (Quassel)'), 'glyphicon-retweet',
-                     'quassel:index', 730)
+    menu.add_urlname(title, 'glyphicon-retweet', 'quassel:index', 730)
 
     global service
     service = service_module.Service(
-        'quassel-plinth', _('Quassel IRC Client'),
-        is_external=True, enabled=is_enabled())
+        'quassel-plinth', title, is_external=True, enabled=is_enabled())
+
+
+def setup(helper, old_version=None):
+    """Install and configure the module."""
+    helper.install(['quassel-core'])
+    helper.call('post', service.notify_enabled, None, True)
 
 
 def is_enabled():
diff --git a/plinth/modules/quassel/templates/quassel.html b/plinth/modules/quassel/templates/quassel.html
index c2f47ce0c..227769463 100644
--- a/plinth/modules/quassel/templates/quassel.html
+++ b/plinth/modules/quassel/templates/quassel.html
@@ -1,4 +1,4 @@
-{% extends "base.html" %}
+{% extends "app.html" %}
 {% comment %}
 #
 # This file is part of Plinth.
@@ -21,31 +21,7 @@
 {% load bootstrap %}
 {% load i18n %}
 
-{% block content %}
-
-  <h2>{% trans "IRC Client (Quassel)" %}</h2>
-
-  <p>
-    {% blocktrans trimmed %}
-      Quassel is an IRC application that is split into two parts, a
-      "core" and a "client". This allows the core to remain connected
-      to IRC servers, and to continue receiving messages, even when
-      the client is disconnected. {{ box_name }} can run the Quassel
-      core service keeping you always online and one or more Quassel
-      clients from a desktop or a mobile can be used to connect and
-      disconnect from it.
-    {% endblocktrans %}
-  </p>
-
-  <p>
-    {% blocktrans trimmed %}
-    You can connect to your Quassel core on the default Quassel port
-    4242.  Clients to connect to Quassel from your
-    <a href="http://quassel-irc.org/downloads">desktop</a> and
-    <a href="http://quasseldroid.iskrembilen.com/">mobile</a> devices
-    are available.
-    {% endblocktrans %}
-  </p>
+{% block configuration %}
 
   <h3>{% trans "Status" %}</h3>
 
diff --git a/plinth/modules/quassel/views.py b/plinth/modules/quassel/views.py
index 3918c849b..2adee5260 100644
--- a/plinth/modules/quassel/views.py
+++ b/plinth/modules/quassel/views.py
@@ -25,16 +25,9 @@ from django.utils.translation import ugettext as _
 
 from .forms import QuasselForm
 from plinth import actions
-from plinth import package
 from plinth.modules import quassel
 
 
-def on_install():
-    """Notify that the service is now enabled."""
-    quassel.service.notify_enabled(None, True)
-
-
-@package.required(['quassel-core'], on_install=on_install)
 def index(request):
     """Serve configuration page."""
     status = get_status()
@@ -51,7 +44,8 @@ def index(request):
         form = QuasselForm(initial=status, prefix='quassel')
 
     return TemplateResponse(request, 'quassel.html',
-                            {'title': _('IRC Client (Quassel)'),
+                            {'title': quassel.title,
+                             'description': quassel.description,
                              'status': status,
                              'form': form})
 
diff --git a/plinth/modules/repro/__init__.py b/plinth/modules/repro/__init__.py
index 7517052f8..0a72adcf8 100644
--- a/plinth/modules/repro/__init__.py
+++ b/plinth/modules/repro/__init__.py
@@ -21,11 +21,37 @@ Plinth module for repro.
 
 from django.utils.translation import ugettext_lazy as _
 
+from plinth import actions
 from plinth import action_utils
 from plinth import cfg
 from plinth import service as service_module
 
-depends = ['plinth.modules.apps']
+version = 1
+
+depends = ['apps']
+
+title = _('SIP Server (repro)')
+
+description = [
+    _('repro provides various SIP services that a SIP softphone can utilize '
+      'to provide audio and video calls as well as presence and instant '
+      'messaging. repro provides a server and SIP user accounts that clients '
+      'can use to let their presence known.  It also acts as a proxy to '
+      'federate SIP communications to other servers on the Internet similar '
+      'to email.'),
+
+    _('To make SIP calls, a client application is needed. Available clients '
+      'include <a href="https://jitsi.org/">Jitsi</a> (for computers) and '
+      '<a href="https://f-droid.org/repository/browse/?fdid=com.csipsimple"> '
+      'CSipSimple</a> (for Android phones).'),
+
+    _('<strong>Note:</strong>  Before using repro, domains and users will '
+      'need to be configured using the <a href="/repro/domains.html">'
+      'web-based configuration panel</a>. Users in the <em>admin</em> group '
+      'will be able to log in to the repro configuration panel. After setting '
+      'the domain, it is required to restart the repro service. Disable the '
+      'service and re-enable it.'),
+]
 
 service = None
 
@@ -33,13 +59,19 @@ service = None
 def init():
     """Initialize the repro module."""
     menu = cfg.main_menu.get('apps:index')
-    menu.add_urlname(_('SIP Server (repro)'), 'glyphicon-phone-alt',
-                     'repro:index', 825)
+    menu.add_urlname(title, 'glyphicon-phone-alt', 'repro:index', 825)
 
     global service
     service = service_module.Service(
-        'repro', _('repro SIP Server'), ['sip-plinth', 'sip-tls-plinth'],
-        is_external=True, enabled=is_enabled())
+        'repro', title, ['sip-plinth', 'sip-tls-plinth'], is_external=True,
+        enabled=is_enabled())
+
+
+def setup(helper, old_version=None):
+    """Install and configure the module."""
+    helper.install(['repro'])
+    helper.call('post', actions.superuser_run, 'repro', ['setup'])
+    helper.call('post', service.notify_enabled, None, True)
 
 
 def is_enabled():
diff --git a/plinth/modules/repro/templates/repro.html b/plinth/modules/repro/templates/repro.html
index 1d4b2fe7d..df5109cb0 100644
--- a/plinth/modules/repro/templates/repro.html
+++ b/plinth/modules/repro/templates/repro.html
@@ -1,4 +1,4 @@
-{% extends "base.html" %}
+{% extends "app.html" %}
 {% comment %}
 #
 # This file is part of Plinth.
@@ -21,39 +21,7 @@
 {% load bootstrap %}
 {% load i18n %}
 
-{% block content %}
-
-  <h2>{% trans "SIP Server (repro)" %}</h2>
-
-  <p>
-    {% blocktrans trimmed %}
-      repro provides various SIP services that a SIP softphone can utilize to
-      provide audio and video calls as well as presence and instant messaging.
-      repro provides a server and SIP user accounts that clients can use to let
-      their presence known.  It also acts as a proxy to federate SIP
-      communications to other servers on the Internet similar to email.
-    {% endblocktrans %}
-  </p>
-
-  <p>
-    {% blocktrans trimmed %}
-      To make SIP calls, a client application is needed. Available clients
-      include <a href="https://jitsi.org/">Jitsi</a> (for computers) and
-      <a href="https://f-droid.org/repository/browse/?fdid=com.csipsimple">
-        CSipSimple</a> (for Android phones).
-    {% endblocktrans %}
-  </p>
-
-  <p>
-    {% blocktrans trimmed %}
-      <strong>Note:</strong>  Before using repro, domains and users will need
-      to be configured using the <a href="/repro/domains.html">web-based
-      configuration panel</a>. Users in the <em>admin</em> group will be able
-      to log in to the repro configuration panel. After setting the domain, it
-      is required to restart the repro service. Disable the service and
-      re-enable it.
-    {% endblocktrans %}
-  </p>
+{% block configuration %}
 
   <h3>{% trans "Status" %}</h3>
 
diff --git a/plinth/modules/repro/views.py b/plinth/modules/repro/views.py
index 40392f48a..407a96b0c 100644
--- a/plinth/modules/repro/views.py
+++ b/plinth/modules/repro/views.py
@@ -25,17 +25,9 @@ from django.utils.translation import ugettext as _
 
 from .forms import ReproForm
 from plinth import actions
-from plinth import package
 from plinth.modules import repro
 
 
-def on_install():
-    """Notify that the service is now enabled."""
-    actions.superuser_run('repro', ['setup'])
-    repro.service.notify_enabled(None, True)
-
-
-@package.required(['repro'], on_install=on_install)
 def index(request):
     """Serve configuration page."""
     status = get_status()
@@ -52,7 +44,8 @@ def index(request):
         form = ReproForm(initial=status, prefix='repro')
 
     return TemplateResponse(request, 'repro.html',
-                            {'title': _('SIP Server (repro)'),
+                            {'title': repro.title,
+                             'description': repro.description,
                              'status': status,
                              'form': form})
 
diff --git a/plinth/modules/restore/__init__.py b/plinth/modules/restore/__init__.py
index 21bb030d4..dff18b3d4 100644
--- a/plinth/modules/restore/__init__.py
+++ b/plinth/modules/restore/__init__.py
@@ -22,24 +22,44 @@ Plinth module to configure reStore.
 from django.utils.translation import ugettext_lazy as _
 from plinth import action_utils, cfg
 from plinth import service as service_module
+from plinth.utils import format_lazy
 
 service = None
 
-__all__ = ['init']
+version = 1
 
-depends = ['plinth.modules.apps']
+depends = ['apps']
+
+title = _('Unhosted Storage (reStore)')
+
+description = [
+    format_lazy(
+        _('reStore is a server for <a href=\'https://unhosted.org/\'>'
+          'unhosted</a> web applications.  The idea is to uncouple web '
+          'applications from data.  No matter where a web application is '
+          'served from, the data can be stored on an unhosted storage '
+          'server of user\'s choice.  With reStore, your {box_name} becomes '
+          'your unhosted storage server.'), box_name=_(cfg.box_name)),
+
+    _('You can create and edit accounts in the '
+      '<a href=\'/restore/\'>reStore web-interface</a>.')
+]
 
 
 def init():
     """Initialize the reStore module."""
     menu = cfg.main_menu.get('apps:index')
-    menu.add_urlname(_('Unhosted Storage (reStore)'), 'glyphicon-hdd',
-                     'restore:index', 750)
+    menu.add_urlname(title, 'glyphicon-hdd', 'restore:index', 750)
 
     global service
     service = service_module.Service(
-        'node-restore', _('reStore'), ['http', 'https'],
-        is_external=False, enabled=is_enabled())
+        'node-restore', title, ['http', 'https'], is_external=False,
+        enabled=is_enabled())
+
+
+def setup(helper, old_version=None):
+    """Install and configure the module."""
+    helper.install(['node-restore'])
 
 
 def is_enabled():
diff --git a/plinth/modules/restore/templates/restore_index.html b/plinth/modules/restore/templates/restore_index.html
index 8c9402ba7..4148a047c 100644
--- a/plinth/modules/restore/templates/restore_index.html
+++ b/plinth/modules/restore/templates/restore_index.html
@@ -1,4 +1,4 @@
-{% extends "base.html" %}
+{% extends "app.html" %}
 {% comment %}
 #
 # This file is part of Plinth.
@@ -21,27 +21,7 @@
 {% load bootstrap %}
 {% load i18n %}
 
-{% block content %}
-
-  <h2>{% trans "Unhosted Storage (reStore)" %}</h2>
-
-  <p>
-    {% blocktrans trimmed %}
-      reStore is a server for <a href='https://unhosted.org/'>unhosted</a>
-      web applications.  The idea is to uncouple web applications from
-      data.  No matter where a web application is served from, the
-      data can be stored on an unhosted storage server of user's
-      choice.  With reStore, your {{ box_name }} becomes your
-      unhosted storage server.
-    {% endblocktrans %}
-  </p>
-
-  <p>
-    {% blocktrans trimmed %}
-      You can create and edit accounts in the
-      <a href='/restore/'>reStore web-interface</a>.
-    {% endblocktrans %}
-  </p>
+{% block configuration %}
 
   <h3>Configuration</h3>
 
diff --git a/plinth/modules/restore/views.py b/plinth/modules/restore/views.py
index e0c75fbd6..0e91904a4 100644
--- a/plinth/modules/restore/views.py
+++ b/plinth/modules/restore/views.py
@@ -24,11 +24,10 @@ from django.template.response import TemplateResponse
 from django.utils.translation import ugettext as _
 
 from .forms import ReStoreForm
-from plinth import actions, package
+from plinth import actions
 from plinth.modules import restore
 
 
-@package.required(['node-restore'])
 def index(request):
     """Serve configuration page."""
     status = get_status()
@@ -43,7 +42,8 @@ def index(request):
         form = ReStoreForm(initial=status, prefix='restore')
 
     return TemplateResponse(request, 'restore_index.html',
-                            {'title': _('Unhosted Storage (reStore)'),
+                            {'title': restore.title,
+                             'description': restore.description,
                              'status': status,
                              'form': form})
 
diff --git a/plinth/modules/roundcube/__init__.py b/plinth/modules/roundcube/__init__.py
index 5d9bd1e40..1c11596af 100644
--- a/plinth/modules/roundcube/__init__.py
+++ b/plinth/modules/roundcube/__init__.py
@@ -24,17 +24,49 @@ from django.utils.translation import ugettext_lazy as _
 from plinth import actions
 from plinth import action_utils
 from plinth import cfg
-from plinth import service as service_module
 
 
-depends = ['plinth.modules.apps']
+version = 1
+
+depends = ['apps']
+
+title = _('Email Client (Roundcube)')
+
+description = [
+    _('Roundcube webmail is a browser-based multilingual IMAP '
+      'client with an application-like user interface. It provides '
+      'full functionality you expect from an email client, including '
+      'MIME support, address book, folder manipulation, message '
+      'searching and spell checking.'),
+
+    _('You can access Roundcube from <a href="/roundcube">'
+      '/roundcube</a>. Provide the username and password of the email '
+      'account you wish to access followed by the domain name of the '
+      'IMAP server for your email provider, like <code>imap.example.com'
+      '</code>.  For IMAP over SSL (recommended), fill the server field '
+      'like <code>imaps://imap.example.com</code>.'),
+
+    _('For Gmail, username will be your Gmail address, password will be '
+      'your Google account password and server will be '
+      '<code>imaps://imap.gmail.com</code>.  Note that you will also need '
+      'to enable "Less secure apps" in your Google account settings '
+      '(<a href="https://www.google.com/settings/security/lesssecureapps"'
+      '>https://www.google.com/settings/security/lesssecureapps</a>).'),
+]
 
 
 def init():
     """Intialize the module."""
     menu = cfg.main_menu.get('apps:index')
-    menu.add_urlname(_('Email Client (Roundcube)'), 'glyphicon-envelope',
-                     'roundcube:index', 600)
+    menu.add_urlname(title, 'glyphicon-envelope', 'roundcube:index', 600)
+
+
+def setup(helper, old_version=None):
+    """Install and configure the module."""
+    helper.call('pre', actions.superuser_run, 'roundcube', ['pre-install'])
+    helper.install(['sqlite3', 'roundcube', 'roundcube-sqlite3'])
+    helper.call('pre', actions.superuser_run, 'roundcube', ['setup'])
+
 
 def is_enabled():
     """Return whether the module is enabled."""
diff --git a/plinth/modules/roundcube/templates/roundcube.html b/plinth/modules/roundcube/templates/roundcube.html
index fea5d2c92..6028f7aba 100644
--- a/plinth/modules/roundcube/templates/roundcube.html
+++ b/plinth/modules/roundcube/templates/roundcube.html
@@ -1,4 +1,4 @@
-{% extends "base.html" %}
+{% extends "app.html" %}
 {% comment %}
 #
 # This file is part of Plinth.
@@ -21,41 +21,7 @@
 {% load bootstrap %}
 {% load i18n %}
 
-{% block content %}
-
-  <h2>{% trans "Email Client (Roundcube)" %}</h2>
-
-  <p>
-    {% blocktrans trimmed %}
-      Roundcube webmail is a browser-based multilingual IMAP client
-      with an application-like user interface. It provides full
-      functionality you expect from an email client, including MIME
-      support, address book, folder manipulation, message searching
-      and spell checking.
-    {% endblocktrans %}
-  </p>
-
-  <p>
-    {% blocktrans trimmed %}
-      You can access Roundcube from <a href="/roundcube">/roundcube</a>.
-      Provide the username and password of the email account you wish
-      to access followed by the domain name of the IMAP server for
-      your email provider, like <code>imap.example.com</code>.  For
-      IMAP over SSL (recommended), fill the server field like
-      <code>imaps://imap.example.com</code>.
-    {% endblocktrans %}
-  </p>
-
-  <p>
-    {% blocktrans trimmed %}
-      For Gmail, username will be your Gmail address, password will be
-      your Google account password and server will be
-      <code>imaps://imap.gmail.com</code>.  Note that you will also need
-      to enable "Less secure apps" in your Google account settings
-      (<a href="https://www.google.com/settings/security/lesssecureapps"
-       >https://www.google.com/settings/security/lesssecureapps</a>).
-    {% endblocktrans %}
-  </p>
+{% block configuration %}
 
   {% include "diagnostics_button.html" with module="roundcube" %}
 
diff --git a/plinth/modules/roundcube/views.py b/plinth/modules/roundcube/views.py
index 1790d8868..610fdb8c0 100644
--- a/plinth/modules/roundcube/views.py
+++ b/plinth/modules/roundcube/views.py
@@ -26,24 +26,11 @@ import logging
 
 from .forms import RoundcubeForm
 from plinth import actions
-from plinth import package
 from plinth.modules import roundcube
 
 logger = logging.getLogger(__name__)
 
 
-def before_install():
-    """Preseed debconf values before the packages are installed."""
-    actions.superuser_run('roundcube', ['pre-install'])
-
-
-def on_install():
-    """Setup Roundcube Apache configuration."""
-    actions.superuser_run('roundcube', ['setup'])
-
-
-@package.required(['sqlite3', 'roundcube', 'roundcube-sqlite3'],
-                  before_install=before_install, on_install=on_install)
 def index(request):
     """Serve configuration page."""
     status = get_status()
@@ -61,7 +48,8 @@ def index(request):
         form = RoundcubeForm(initial=status, prefix='roundcube')
 
     return TemplateResponse(request, 'roundcube.html',
-                            {'title': _('Email Client (Roundcube)'),
+                            {'title': roundcube.title,
+                             'description': roundcube.description,
                              'status': status,
                              'form': form})
 
diff --git a/plinth/modules/shaarli/__init__.py b/plinth/modules/shaarli/__init__.py
index e23af9186..2210da998 100644
--- a/plinth/modules/shaarli/__init__.py
+++ b/plinth/modules/shaarli/__init__.py
@@ -26,7 +26,20 @@ from plinth import cfg
 from plinth import service as service_module
 
 
-depends = ['plinth.modules.apps']
+version = 1
+
+depends = ['apps']
+
+title = _('Bookmarks (Shaarli)')
+
+description = [
+    _('Shaarli allows you to save and share bookmarks.'),
+
+    _('When enabled, Shaarli will be available from <a href="/shaarli">'
+      '/shaarli</a> path on the web server. Note that Shaarli only supports a '
+      'single user account, which you will need to setup on the initial '
+      'visit.'),
+]
 
 service = None
 
@@ -34,13 +47,18 @@ service = None
 def init():
     """Initialize the module."""
     menu = cfg.main_menu.get('apps:index')
-    menu.add_urlname(_('Bookmarks (Shaarli)'), 'glyphicon-bookmark',
-                     'shaarli:index', 350)
+    menu.add_urlname(title, 'glyphicon-bookmark', 'shaarli:index', 350)
 
     global service
     service = service_module.Service(
-        'shaarli', _('Shaarli'), ['http', 'https'],
-        is_external=True, enabled=is_enabled())
+        'shaarli', title, ['http', 'https'], is_external=True,
+        enabled=is_enabled())
+
+
+def setup(helper, old_version=None):
+    """Install and configure the module."""
+    helper.install(['shaarli'])
+    helper.call('post', service.notify_enabled, None, True)
 
 
 def is_enabled():
diff --git a/plinth/modules/shaarli/templates/shaarli.html b/plinth/modules/shaarli/templates/shaarli.html
index 391c25466..9a6c55b0a 100644
--- a/plinth/modules/shaarli/templates/shaarli.html
+++ b/plinth/modules/shaarli/templates/shaarli.html
@@ -1,4 +1,4 @@
-{% extends "base.html" %}
+{% extends "app.html" %}
 {% comment %}
 #
 # This file is part of Plinth.
@@ -21,21 +21,7 @@
 {% load bootstrap %}
 {% load i18n %}
 
-{% block content %}
-
-  <h2>{% trans "Bookmarks (Shaarli)" %}</h2>
-
-  <p>{% trans "Shaarli allows you to save and share bookmarks." %}</p>
-
-  <p>
-    {% blocktrans trimmed %}
-
-      When enabled, Shaarli will be available from <a href="/shaarli">/shaarli</a>
-      path on the web server. Note that Shaarli only supports a single
-      user account, which you will need to setup on the initial visit.
-
-    {% endblocktrans %}
-  </p>
+{% block configuration %}
 
   <h3>{% trans "Configuration" %}</h3>
 
diff --git a/plinth/modules/shaarli/views.py b/plinth/modules/shaarli/views.py
index 6182db539..de174faa7 100644
--- a/plinth/modules/shaarli/views.py
+++ b/plinth/modules/shaarli/views.py
@@ -25,14 +25,9 @@ from django.utils.translation import ugettext as _
 
 from .forms import ShaarliForm
 from plinth import actions
-from plinth import package
 from plinth.modules import shaarli
 
-def on_install():
-    """Notify that the service is now enabled."""
-    shaarli.service.notify_enabled(None, True)
 
-@package.required(['shaarli'], on_install=on_install)
 def index(request):
     """Serve configuration page."""
     status = get_status()
@@ -49,7 +44,8 @@ def index(request):
         form = ShaarliForm(initial=status, prefix='shaarli')
 
     return TemplateResponse(request, 'shaarli.html',
-                            {'title': _('Bookmarks (Shaarli)'),
+                            {'title': shaarli.title,
+                             'description': shaarli.description,
                              'status': status,
                              'form': form})
 
diff --git a/plinth/modules/system/__init__.py b/plinth/modules/system/__init__.py
index ec0f9e62d..7b75d3976 100644
--- a/plinth/modules/system/__init__.py
+++ b/plinth/modules/system/__init__.py
@@ -19,8 +19,29 @@
 Plinth module for system section page
 """
 
-from . import system
-from .system import init
+from django.utils.translation import ugettext_lazy as _
+
+from plinth import cfg
+from plinth.utils import format_lazy
 
 
-__all__ = ['system', 'init']
+version = 1
+
+is_essential = 1
+
+title = _('System Configuration')
+
+description = [
+    format_lazy(
+        _('Here you can administrate the underlying system of your '
+          '{box_name}.'), box_name=_(cfg.box_name)),
+
+    format_lazy(
+        _('The options affect the {box_name} at its most general level, '
+          'so be careful!'), box_name=_(cfg.box_name))
+]
+
+
+def init():
+    """Initialize the system module"""
+    cfg.main_menu.add_urlname(title, 'glyphicon-cog', 'system:index', 100)
diff --git a/plinth/modules/system/templates/system.html b/plinth/modules/system/templates/system.html
index e8c2a46f3..a60745d8f 100644
--- a/plinth/modules/system/templates/system.html
+++ b/plinth/modules/system/templates/system.html
@@ -1,4 +1,4 @@
-{% extends 'base.html' %}
+{% extends 'app.html' %}
 {% comment %}
 #
 # This file is part of Plinth.
@@ -17,25 +17,3 @@
 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
 #
 {% endcomment %}
-
-{% load i18n %}
-
-{% block content %}
-
-  <h2>{% trans "System Configuration" %}</h2>
-
-  <p>
-    {% blocktrans trimmed %}
-      Here you can administrate the underlying system of your
-      {{ box_name }}.
-    {% endblocktrans %}
-  </p>
-
-  <p>
-    {% blocktrans trimmed %}
-      The options affect the {{ box_name }} at its most general level,
-      so be careful!
-    {% endblocktrans %}
-  </p>
-
-{% endblock %}
diff --git a/plinth/modules/system/urls.py b/plinth/modules/system/urls.py
index aceecc21d..8e75a6af5 100644
--- a/plinth/modules/system/urls.py
+++ b/plinth/modules/system/urls.py
@@ -21,7 +21,7 @@ URLs for the System module
 
 from django.conf.urls import url
 
-from . import system as views
+from . import views
 
 
 urlpatterns = [
diff --git a/plinth/modules/system/system.py b/plinth/modules/system/views.py
similarity index 73%
rename from plinth/modules/system/system.py
rename to plinth/modules/system/views.py
index c7a68b7f9..bc4dd1953 100644
--- a/plinth/modules/system/system.py
+++ b/plinth/modules/system/views.py
@@ -16,18 +16,12 @@
 #
 
 from django.template.response import TemplateResponse
-from django.utils.translation import ugettext_lazy as _
 
-from plinth import cfg
-
-
-def init():
-    """Initialize the system module"""
-    cfg.main_menu.add_urlname(_('System'), 'glyphicon-cog', 'system:index',
-                              100)
+from plinth.modules import system
 
 
 def index(request):
     """Serve the index page"""
     return TemplateResponse(request, 'system.html',
-                            {'title': _('System Configuration')})
+                            {'title': system.title,
+                             'description': system.description})
diff --git a/plinth/modules/tor/__init__.py b/plinth/modules/tor/__init__.py
index bd7ef694e..e12773198 100644
--- a/plinth/modules/tor/__init__.py
+++ b/plinth/modules/tor/__init__.py
@@ -20,7 +20,7 @@ Plinth module to configure Tor.
 """
 
 import augeas
-from django.utils.translation import ugettext as _
+from django.utils.translation import ugettext_lazy as _
 import glob
 import itertools
 
@@ -32,7 +32,20 @@ from plinth.modules.names import SERVICES
 from plinth.signals import domain_added
 
 
-depends = ['plinth.modules.apps', 'plinth.modules.names']
+version = 1
+
+depends = ['apps', 'names']
+
+title = _('Anonymity Network (Tor)')
+
+description = [
+    _('Tor is an anonymous communication system. You can learn more '
+      'about it from the <a href="https://www.torproject.org/">Tor '
+      'Project</a> website. For best protection when web surfing, the '
+      'Tor Project recommends that you use the '
+      '<a href="https://www.torproject.org/download/download-easy.html.en">'
+      'Tor Browser</a>.')
+]
 
 socks_service = None
 bridge_service = None
@@ -45,8 +58,7 @@ APT_TOR_PREFIX = 'tor+'
 def init():
     """Initialize the module."""
     menu = cfg.main_menu.get('apps:index')
-    menu.add_urlname(_('Anonymity Network (Tor)'), 'glyphicon-eye-close',
-                     'tor:index', 100)
+    menu.add_urlname(title, 'glyphicon-eye-close', 'tor:index', 100)
 
     global socks_service
     socks_service = service_module.Service(
@@ -77,6 +89,17 @@ def init():
         services=hs_services)
 
 
+def setup(helper, old_version=None):
+    """Install and configure the module."""
+    helper.install(['tor', 'tor-geoipdb', 'torsocks', 'obfs4proxy',
+                    'apt-transport-tor'])
+    helper.call('post', actions.superuser_run, 'tor', ['setup'])
+    helper.call('post', actions.superuser_run, 'tor',
+                ['configure', '--apt-transport-tor', 'enable'])
+    helper.call('post', socks_service.notify_enabled, None, True)
+    helper.call('post', bridge_service.notify_enabled, None, True)
+
+
 def is_enabled():
     """Return whether the module is enabled."""
     return action_utils.service_is_enabled('tor')
diff --git a/plinth/modules/tor/templates/tor.html b/plinth/modules/tor/templates/tor.html
index 2b1b0f07e..9b6db3ed5 100644
--- a/plinth/modules/tor/templates/tor.html
+++ b/plinth/modules/tor/templates/tor.html
@@ -1,4 +1,4 @@
-{% extends "base.html" %}
+{% extends "app.html" %}
 {% comment %}
 #
 # This file is part of Plinth.
@@ -30,20 +30,7 @@
 {% endblock %}
 
 
-{% block content %}
-
-  <h2>{% trans "Anonymity Network (Tor)" %}</h2>
-
-  <p>
-    {% blocktrans trimmed %}
-      Tor is an anonymous communication system. You can learn more
-      about it from the <a href="https://www.torproject.org/">Tor
-      Project</a> website. For best protection when web surfing, the
-      Tor Project recommends that you use the
-      <a href="https://www.torproject.org/download/download-easy.html.en">
-      Tor Browser</a>.
-    {% endblocktrans %}
-  </p>
+{% block configuration %}
 
   <h3>{% trans "Status" %}</h3>
 
diff --git a/plinth/modules/tor/views.py b/plinth/modules/tor/views.py
index 120e42133..58e513a1f 100644
--- a/plinth/modules/tor/views.py
+++ b/plinth/modules/tor/views.py
@@ -25,7 +25,6 @@ from django.utils.translation import ugettext_lazy as _
 
 from .forms import TorForm
 from plinth import actions
-from plinth import package
 from plinth.errors import ActionError
 from plinth.modules import tor
 from plinth.modules.names import SERVICES
@@ -34,18 +33,6 @@ from plinth.signals import domain_added, domain_removed
 config_process = None
 
 
-def on_install():
-    """Setup Tor configuration as soon as it is installed."""
-    actions.superuser_run('tor', ['setup'])
-    actions.superuser_run('tor',
-                          ['configure', '--apt-transport-tor', 'enable'])
-    tor.socks_service.notify_enabled(None, True)
-    tor.bridge_service.notify_enabled(None, True)
-
-
-@package.required(['tor', 'tor-geoipdb', 'torsocks', 'obfs4proxy',
-                   'apt-transport-tor'],
-                  on_install=on_install)
 def index(request):
     """Serve configuration page."""
     if config_process:
@@ -65,7 +52,8 @@ def index(request):
         form = TorForm(initial=status, prefix='tor')
 
     return TemplateResponse(request, 'tor.html',
-                            {'title': _('Tor Control Panel'),
+                            {'title': tor.title,
+                             'description': tor.description,
                              'status': status,
                              'config_running': bool(config_process),
                              'form': form})
diff --git a/plinth/modules/transmission/__init__.py b/plinth/modules/transmission/__init__.py
index b57797b99..aed1380ed 100644
--- a/plinth/modules/transmission/__init__.py
+++ b/plinth/modules/transmission/__init__.py
@@ -20,6 +20,7 @@ Plinth module to configure Transmission server
 """
 
 from django.utils.translation import ugettext_lazy as _
+import json
 
 from plinth import actions
 from plinth import action_utils
@@ -27,7 +28,17 @@ from plinth import cfg
 from plinth import service as service_module
 
 
-depends = ['plinth.modules.apps']
+version = 1
+
+depends = ['apps']
+
+title = _('BitTorrent (Transmission)')
+
+description = [
+    _('BitTorrent is a peer-to-peer file sharing protocol. '
+      'Transmission daemon handles Bitorrent file sharing.  Note that '
+      'BitTorrent is not anonymous.')
+]
 
 service = None
 
@@ -35,13 +46,25 @@ service = None
 def init():
     """Intialize the Transmission module."""
     menu = cfg.main_menu.get('apps:index')
-    menu.add_urlname(_('BitTorrent (Transmission)'), 'glyphicon-save',
-                     'transmission:index', 300)
+    menu.add_urlname(title, 'glyphicon-save', 'transmission:index', 300)
 
     global service
     service = service_module.Service(
-        'transmission', _('Transmission BitTorrent'), ['http', 'https'],
-        is_external=True, enabled=is_enabled())
+        'transmission', title, ['http', 'https'], is_external=True,
+        enabled=is_enabled())
+
+
+def setup(helper, old_version=None):
+    """Install and configure the module."""
+    helper.install(['transmission-daemon'])
+
+    new_configuration = {'rpc-whitelist-enabled': False}
+    helper.call('post', actions.superuser_run, 'transmission',
+                ['merge-configuration'],
+                input=json.dumps(new_configuration).encode())
+
+    helper.call('post', actions.superuser_run, 'transmission', ['enable'])
+    helper.call('post', service.notify_enabled, None, True)
 
 
 def is_enabled():
diff --git a/plinth/modules/transmission/templates/transmission.html b/plinth/modules/transmission/templates/transmission.html
index de67c4908..0adf4648f 100644
--- a/plinth/modules/transmission/templates/transmission.html
+++ b/plinth/modules/transmission/templates/transmission.html
@@ -1,4 +1,4 @@
-{% extends "base.html" %}
+{% extends "app.html" %}
 {% comment %}
 #
 # This file is part of Plinth.
@@ -21,17 +21,7 @@
 {% load bootstrap %}
 {% load i18n %}
 
-{% block content %}
-
-  <h2>{% trans "BitTorrent (Transmission)" %}</h2>
-
-  <p>
-    {% blocktrans trimmed %}
-      BitTorrent is a peer-to-peer file sharing protocol.
-      Transmission daemon handles Bitorrent file sharing.  Note that
-      BitTorrent is not anonymous.
-    {% endblocktrans %}
-  </p>
+{% block configuration %}
 
   <p>
     {% blocktrans trimmed %}
diff --git a/plinth/modules/transmission/views.py b/plinth/modules/transmission/views.py
index 213e69da8..c65c81013 100644
--- a/plinth/modules/transmission/views.py
+++ b/plinth/modules/transmission/views.py
@@ -28,7 +28,6 @@ import socket
 
 from .forms import TransmissionForm
 from plinth import actions
-from plinth import package
 from plinth.modules import transmission
 
 logger = logging.getLogger(__name__)
@@ -36,17 +35,6 @@ logger = logging.getLogger(__name__)
 TRANSMISSION_CONFIG = '/etc/transmission-daemon/settings.json'
 
 
-def on_install():
-    """Enable transmission as soon as it is installed."""
-    new_configuration = {'rpc-whitelist-enabled': False}
-    actions.superuser_run('transmission', ['merge-configuration'],
-                          input=json.dumps(new_configuration).encode())
-
-    actions.superuser_run('transmission', ['enable'])
-    transmission.service.notify_enabled(None, True)
-
-
-@package.required(['transmission-daemon'], on_install=on_install)
 def index(request):
     """Serve configuration page."""
     status = get_status()
@@ -64,7 +52,8 @@ def index(request):
         form = TransmissionForm(initial=status, prefix='transmission')
 
     return TemplateResponse(request, 'transmission.html',
-                            {'title': _('BitTorrent (Transmission)'),
+                            {'title': transmission.title,
+                             'description': transmission.description,
                              'status': status,
                              'form': form})
 
diff --git a/plinth/modules/upgrades/__init__.py b/plinth/modules/upgrades/__init__.py
index 28b9f7c4a..795b88e1b 100644
--- a/plinth/modules/upgrades/__init__.py
+++ b/plinth/modules/upgrades/__init__.py
@@ -21,14 +21,32 @@ Plinth module for upgrades
 
 from django.utils.translation import ugettext_lazy as _
 
+from plinth import actions
 from plinth import cfg
 
 
-depends = ['plinth.modules.system']
+version = 1
+
+is_essential = 1
+
+depends = ['system']
+
+title = _('Software Upgrades')
+
+description = [
+    _('Upgrades install the latest software and security updates. When '
+      'automatic upgrades are enabled, upgrades are automatically run every '
+      'night. You don\'t normally need to start the upgrade process.')
+]
 
 
 def init():
     """Initialize the module."""
     menu = cfg.main_menu.get('system:index')
-    menu.add_urlname(_('Software Upgrades'), 'glyphicon-refresh',
-                     'upgrades:index', 21)
+    menu.add_urlname(title, 'glyphicon-refresh', 'upgrades:index', 21)
+
+
+def setup(helper, old_version=None):
+    """Install and configure the module."""
+    helper.install(['unattended-upgrades'])
+    helper.call('post', actions.superuser_run, 'upgrades', ['enable-auto'])
diff --git a/plinth/modules/upgrades/templates/upgrades.html b/plinth/modules/upgrades/templates/upgrades.html
index 15b0167b2..4cc47be98 100644
--- a/plinth/modules/upgrades/templates/upgrades.html
+++ b/plinth/modules/upgrades/templates/upgrades.html
@@ -1,4 +1,4 @@
-{% extends 'base.html' %}
+{% extends 'app.html' %}
 {% comment %}
 #
 # This file is part of Plinth.
@@ -29,17 +29,7 @@
 {% endblock %}
 
 
-{% block content %}
-
-  <h2>{{ title }}</h2>
-
-  <p>
-    {% blocktrans trimmed %}
-      Upgrades install the latest software and security updates. When automatic
-      upgrades are enabled, upgrades are automatically run every night. You
-      don't normally need to start the upgrade process.
-    {% endblocktrans %}
-  </p>
+{% block configuration %}
 
   <p>
     {% blocktrans trimmed %}
diff --git a/plinth/modules/upgrades/templates/upgrades_configure.html b/plinth/modules/upgrades/templates/upgrades_configure.html
index 1ee94ec32..4a4e1c3fe 100644
--- a/plinth/modules/upgrades/templates/upgrades_configure.html
+++ b/plinth/modules/upgrades/templates/upgrades_configure.html
@@ -1,4 +1,4 @@
-{% extends "base.html" %}
+{% extends "app.html" %}
 {% comment %}
 #
 # This file is part of Plinth.
@@ -21,9 +21,7 @@
 {% load bootstrap %}
 {% load i18n %}
 
-{% block content %}
-
-  <h2>{{ title }}</h2>
+{% block configuration %}
 
   <form class="form" method="post">
     {% csrf_token %}
diff --git a/plinth/modules/upgrades/views.py b/plinth/modules/upgrades/views.py
index d08d6f291..81b0a4ba3 100644
--- a/plinth/modules/upgrades/views.py
+++ b/plinth/modules/upgrades/views.py
@@ -21,16 +21,14 @@ Plinth module for upgrades
 
 from django.contrib import messages
 from django.core.urlresolvers import reverse_lazy
-from django.shortcuts import redirect
 from django.template.response import TemplateResponse
 from django.utils.translation import ugettext as _, ugettext_lazy
-from django.views.decorators.http import require_POST
 import subprocess
 
 from .forms import ConfigureForm
 from plinth import actions
-from plinth import package
 from plinth.errors import ActionError
+from plinth.modules import upgrades
 
 subsubmenu = [{'url': reverse_lazy('upgrades:index'),
                'text': ugettext_lazy('Automatic Upgrades')},
@@ -41,12 +39,6 @@ LOG_FILE = '/var/log/unattended-upgrades/unattended-upgrades.log'
 LOCK_FILE = '/var/log/dpkg/lock'
 
 
-def on_install():
-    """Enable automatic upgrades after install."""
-    actions.superuser_run('upgrades', ['enable-auto'])
-
-
-@package.required(['unattended-upgrades'], on_install=on_install)
 def index(request):
     """Serve the configuration form."""
     status = get_status()
@@ -63,10 +55,12 @@ def index(request):
         form = ConfigureForm(initial=status, prefix='upgrades')
 
     return TemplateResponse(request, 'upgrades_configure.html',
-                            {'title': _('Automatic Upgrades'),
+                            {'title': upgrades.title,
+                             'description': upgrades.description,
                              'form': form,
                              'subsubmenu': subsubmenu})
 
+
 def is_package_manager_busy():
     """Return whether a package manager is running."""
     try:
@@ -85,7 +79,6 @@ def get_log():
         return None
 
 
-@package.required(['unattended-upgrades'], on_install=on_install)
 def upgrade(request):
     """Serve the upgrade page."""
     is_busy = is_package_manager_busy()
@@ -99,7 +92,8 @@ def upgrade(request):
             messages.error(request, _('Starting upgrade failed.'))
 
     return TemplateResponse(request, 'upgrades.html',
-                            {'title': _('Package Upgrades'),
+                            {'title': upgrades.title,
+                             'description': upgrades.description,
                              'subsubmenu': subsubmenu,
                              'is_busy': is_busy,
                              'log': get_log()})
diff --git a/plinth/modules/users/__init__.py b/plinth/modules/users/__init__.py
index 7232efaa1..b7c6c8ca1 100644
--- a/plinth/modules/users/__init__.py
+++ b/plinth/modules/users/__init__.py
@@ -20,21 +20,24 @@ Plinth module to manage users
 """
 
 from django.utils.translation import ugettext_lazy as _
-import json
 import subprocess
 
 from plinth import cfg
-from plinth import actions
 from plinth import action_utils
 
-depends = ['plinth.modules.system']
+version = 1
+
+is_essential = True
+
+depends = ['system']
+
+title = _('Users and Groups')
 
 
 def init():
     """Intialize the user module."""
     menu = cfg.main_menu.get('system:index')
-    menu.add_urlname(_('Users and Groups'), 'glyphicon-user', 'users:index',
-                     15)
+    menu.add_urlname(title, 'glyphicon-user', 'users:index', 15)
 
 
 def diagnose():
diff --git a/plinth/modules/xmpp/__init__.py b/plinth/modules/xmpp/__init__.py
index d0851c24a..1365f1d98 100644
--- a/plinth/modules/xmpp/__init__.py
+++ b/plinth/modules/xmpp/__init__.py
@@ -20,7 +20,8 @@ Plinth module to configure XMPP server
 """
 
 from django.utils.translation import ugettext_lazy as _
-import json
+import logging
+import socket
 
 from plinth import actions
 from plinth import action_utils
@@ -30,21 +31,35 @@ from plinth.signals import pre_hostname_change, post_hostname_change
 from plinth.signals import domainname_change
 
 
-depends = ['plinth.modules.apps']
+version = 1
+
+depends = ['apps']
+
+title = _('Chat Server (XMPP)')
+
+description = [
+    _('XMPP is an open and standardized communication protocol. Here '
+      'you can run and configure your XMPP server, called ejabberd.'),
+
+    _('To actually communicate, you can use the <a href=\'/jwchat\'>web '
+      'client</a> or any other '
+      '<a href=\'http://xmpp.org/xmpp-software/clients/\' target=\'_blank\''
+      '>XMPP client</a>.')
+]
 
 service = None
 
+logger = logging.getLogger(__name__)
+
 
 def init():
     """Initialize the XMPP module"""
     menu = cfg.main_menu.get('apps:index')
-    menu.add_urlname(_('Chat Server (XMPP)'), 'glyphicon-comment',
-                     'xmpp:index', 400)
+    menu.add_urlname(title, 'glyphicon-comment', 'xmpp:index', 400)
 
     global service
     service = service_module.Service(
-        'xmpp', _('Chat Server (XMPP)'),
-        ['xmpp-client', 'xmpp-server', 'xmpp-bosh'],
+        'xmpp', title, ['xmpp-client', 'xmpp-server', 'xmpp-bosh'],
         is_external=True, enabled=is_enabled())
 
     pre_hostname_change.connect(on_pre_hostname_change)
@@ -52,6 +67,18 @@ def init():
     domainname_change.connect(on_domainname_change)
 
 
+def setup(helper, old_version=None):
+    """Install and configure the module."""
+    domainname = get_domainname()
+    logger.info('XMPP service domainname - %s', domainname)
+
+    helper.call('pre', actions.superuser_run, 'xmpp',
+                ['pre-install', '--domainname', domainname])
+    helper.install(['jwchat', 'ejabberd'])
+    helper.call('post', actions.superuser_run, 'xmpp', ['setup'])
+    helper.call('post', service.notify_enabled, None, True)
+
+
 def is_enabled():
     """Return whether the module is enabled."""
     return (action_utils.service_is_enabled('ejabberd') and
@@ -63,6 +90,12 @@ def is_running():
     return action_utils.service_is_running('ejabberd')
 
 
+def get_domainname():
+    """Return the domainname"""
+    fqdn = socket.getfqdn()
+    return '.'.join(fqdn.split('.')[1:])
+
+
 def on_pre_hostname_change(sender, old_hostname, new_hostname, **kwargs):
     """
     Backup ejabberd database before hostname is changed.
diff --git a/plinth/modules/xmpp/templates/xmpp.html b/plinth/modules/xmpp/templates/xmpp.html
index b0f3ac56b..31e387be2 100644
--- a/plinth/modules/xmpp/templates/xmpp.html
+++ b/plinth/modules/xmpp/templates/xmpp.html
@@ -1,4 +1,4 @@
-{% extends "base.html" %}
+{% extends "app.html" %}
 {% comment %}
 #
 # This file is part of Plinth.
@@ -21,24 +21,7 @@
 {% load bootstrap %}
 {% load i18n %}
 
-{% block content %}
-
-  <h2>{% trans "Chat Server (XMPP)" %}</h2>
-
-  <p>
-    {% blocktrans trimmed %}
-      XMPP is an open and standardized communication protocol. Here
-      you can run and configure your XMPP server, called ejabberd.
-    {% endblocktrans %}
-  </p>
-
-  <p>
-    {% blocktrans trimmed %}
-      To actually communicate, you can use the <a href='/jwchat'>web
-      client</a> or any other <a href='http://xmpp.org/xmpp-software/clients/'
-      target='_blank'>XMPP client</a>.
-    {% endblocktrans %}
-  </p>
+{% block configuration %}
 
   <p>
     {% url 'config:index' as index_url %}
diff --git a/plinth/modules/xmpp/views.py b/plinth/modules/xmpp/views.py
index 817417177..ca1841535 100644
--- a/plinth/modules/xmpp/views.py
+++ b/plinth/modules/xmpp/views.py
@@ -23,39 +23,15 @@ from django.contrib import messages
 from django.template.response import TemplateResponse
 from django.utils.translation import ugettext as _
 import logging
-import socket
 
 from .forms import XmppForm
 from plinth import actions
-from plinth import package
 from plinth.modules import xmpp
 
 
 logger = logging.getLogger(__name__)
 
 
-def get_domainname():
-    """Return the domainname"""
-    fqdn = socket.getfqdn()
-    return '.'.join(fqdn.split('.')[1:])
-
-
-def before_install():
-    """Preseed debconf values before the packages are installed."""
-    domainname = get_domainname()
-    logger.info('XMPP service domainname - %s', domainname)
-    actions.superuser_run('xmpp', ['pre-install', '--domainname', domainname])
-
-
-def on_install():
-    """Setup jwchat apache conf"""
-    actions.superuser_run('xmpp', ['setup'])
-    xmpp.service.notify_enabled(None, True)
-
-
-@package.required(['jwchat', 'ejabberd'],
-                  before_install=before_install,
-                  on_install=on_install)
 def index(request):
     """Serve configuration page"""
     status = get_status()
@@ -72,7 +48,8 @@ def index(request):
         form = XmppForm(initial=status, prefix='xmpp')
 
     return TemplateResponse(request, 'xmpp.html',
-                            {'title': _('Chat Server (XMPP)'),
+                            {'title': xmpp.title,
+                             'description': xmpp.description,
                              'status': status,
                              'form': form})
 
@@ -81,7 +58,7 @@ def get_status():
     """Get the current settings."""
     status = {'enabled': xmpp.is_enabled(),
               'is_running': xmpp.is_running(),
-              'domainname': get_domainname()}
+              'domainname': xmpp.get_domainname()}
 
     return status
 
diff --git a/plinth/package.py b/plinth/package.py
index 75a8bfca0..8a46401ca 100644
--- a/plinth/package.py
+++ b/plinth/package.py
@@ -19,13 +19,9 @@
 Framework for installing and updating distribution packages
 """
 
-from django.contrib import messages
 from django.utils.translation import ugettext as _
-import functools
 import logging
-import threading
 
-import plinth
 from plinth.utils import import_from_gi
 glib = import_from_gi('GLib', '2.0')
 packagekit = import_from_gi('PackageKitGlib', '1.0')
@@ -46,19 +42,21 @@ class PackageException(Exception):
         self.error_string = error_string
         self.error_details = error_details
 
+    def __str__(self):
+        """Return the strin representation of the exception."""
+        return 'PackageException(error_string="{0}", error_details="{1}")' \
+            .format(self.error_string, self.error_details)
+
 
 class Transaction(object):
     """Information about an ongoing transaction."""
 
-    def __init__(self, package_names, before_install=None, on_install=None):
+    def __init__(self, package_names):
         """Initialize transaction object.
 
         Set most values to None until they are sent as progress update.
         """
         self.package_names = package_names
-        # XXX: This is hack, remove after implementing proper setup mechanism.
-        self.before_install = before_install
-        self.on_install = on_install
 
         # Progress
         self.allow_cancel = None
@@ -74,10 +72,6 @@ class Transaction(object):
         self.download_size_remaining = None
         self.speed = None
 
-        # Completion
-        self.is_finished = False
-        self.exception = None
-
     def get_id(self):
         """Return a identifier to use as a key in a map of transactions."""
         return frozenset(self.package_names)
@@ -89,43 +83,12 @@ class Transaction(object):
                     self.package_names, self.allow_cancel, self.status_string,
                     self.percentage, self.package, self.item_progress)
 
-    def start_install(self):
-        """Start a PackageKit transaction to install given list of packages.
-
-        This operation is non-blocking at it spawns a new thread.
-        """
-        thread = threading.Thread(target=self._install)
-        thread.start()
-
-    def _install(self):
+    def install(self):
         """Run a PackageKit transaction to install given packages."""
-        try:
-            if self.before_install:
-                self.before_install()
-        except Exception as exception:
-            logger.exception('Error during setup before install - %s',
-                             exception)
-            self.finish(exception)
-            return
-
         try:
             self._do_install()
-        except PackageException as exception:
-            self.finish(exception)
-            return
         except glib.Error as exception:
-            self.finish(PackageException(exception.message))
-            return
-
-        try:
-            if self.on_install:
-                self.on_install()
-        except Exception as exception:
-            logger.exception('Error during setup - %s', exception)
-            self.finish(exception)
-            return
-
-        self.finish()
+            raise PackageException(exception.message) from exception
 
     def _do_install(self):
         """Run a PackageKit transaction to install given packages.
@@ -203,115 +166,3 @@ class Transaction(object):
         else:
             logger.info('Unhandle packagekit progress callback - %s, %s',
                         progress, progress_type)
-
-    def finish(self, exception=None):
-        """Mark transaction as complected and store exception if any."""
-        self.is_finished = True
-        self.exception = exception
-
-    def collect_result(self):
-        """Retrieve the result of this transaction.
-
-        Also remove self from global transactions list.
-        """
-        assert self.is_finished
-
-        del transactions[self.get_id()]
-        return self.exception
-
-
-def required(package_names, before_install=None, on_install=None):
-    """Decorate a view to check and install required packages."""
-
-    def wrapper2(func):
-        """Return a function to check and install packages."""
-
-        @functools.wraps(func)
-        def wrapper(request, *args, **kwargs):
-            """Check and install packages required by a view."""
-            if not _should_show_install_view(request, package_names):
-                return func(request, *args, **kwargs)
-
-            view = plinth.views.PackageInstallView.as_view()
-            return view(request, package_names=package_names,
-                        before_install=before_install, on_install=on_install,
-                        *args, **kwargs)
-
-        return wrapper
-
-    return wrapper2
-
-
-def _should_show_install_view(request, package_names):
-    """Return whether the installation view should be shown."""
-    transaction_id = frozenset(package_names)
-
-    # No transaction in progress
-    if transaction_id not in transactions:
-        is_installed = check_installed(package_names)
-        return not is_installed
-
-    # Installing
-    transaction = transactions[transaction_id]
-    if not transaction.is_finished:
-        return True
-
-    # Transaction finished, waiting to show the result
-    exception = transaction.collect_result()
-    if not exception:
-        messages.success(request,
-                         _('Installed and configured packages successfully.'))
-        return False
-    else:
-        error_string = getattr(exception, 'error_string', str(exception))
-        error_details = getattr(exception, 'error_details', '')
-        messages.error(request, _('Error installing packages: {string} {details}')
-                       .format(string=error_string, details=error_details))
-        return True
-
-
-def check_installed(package_names):
-    """Return a boolean installed status of package.
-
-    This operation is blocking and waits until the check is finished.
-    """
-    def _callback(progress, progress_type, user_data):
-        """Process progress updates on package resolve operation."""
-        pass
-
-    client = packagekit.Client()
-    response = client.resolve(packagekit.FilterEnum.INSTALLED,
-                              tuple(package_names) + (None, ), None,
-                              _callback, None)
-
-    installed_package_names = []
-    for package in response.get_package_array():
-        if package.get_info() == packagekit.InfoEnum.INSTALLED:
-            installed_package_names.append(package.get_name())
-
-        packages_resolved[package.get_name()] = package
-
-    # When package names could not be resolved
-    for package_name in package_names:
-        if package_name not in packages_resolved:
-            packages_resolved[package_name] = None
-
-    return set(installed_package_names) == set(package_names)
-
-
-def is_installing(package_names):
-    """Return whether a set of packages are currently being installed."""
-    return frozenset(package_names) in transactions
-
-
-def start_install(package_names, before_install=None, on_install=None):
-    """Start a PackageKit transaction to install given list of packages.
-
-    This operation is non-blocking at it spawns a new thread.
-    """
-    transaction = Transaction(package_names,
-                              before_install=before_install,
-                              on_install=on_install)
-    transactions[frozenset(package_names)] = transaction
-
-    transaction.start_install()
diff --git a/plinth/setup.py b/plinth/setup.py
new file mode 100644
index 000000000..c8fd747d2
--- /dev/null
+++ b/plinth/setup.py
@@ -0,0 +1,160 @@
+#
+# This file is part of Plinth.
+#
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU Affero General Public License as
+# published by the Free Software Foundation, either version 3 of the
+# License, or (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU Affero General Public License for more details.
+#
+# You should have received a copy of the GNU Affero General Public License
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+#
+
+"""
+Plinth module with utilites for performing application setup operations.
+"""
+
+import logging
+import threading
+
+from . import package
+import plinth
+
+logger = logging.getLogger(__name__)
+
+
+class Helper(object):
+    """Helper routines for modules to show progress."""
+
+    def __init__(self, module_name, module):
+        """Initialize the object."""
+        self.module_name = module_name
+        self.module = module
+        self.current_operation = None
+        self.is_finished = None
+        self.exception = None
+
+    def run_in_thread(self):
+        """Execute the setup process in a thread."""
+        thread = threading.Thread(target=self._run)
+        thread.start()
+
+    def _run(self):
+        """Collect exceptions when running in a thread."""
+        try:
+            self.run()
+        except Exception as exception:
+            self.exception = exception
+
+    def collect_result(self):
+        """Return the exception if any."""
+        exception = self.exception
+        self.exception = None
+        self.is_finished = None
+        return exception
+
+    def run(self):
+        """Execute the setup process."""
+        # Setup for the module is already running
+        if self.current_operation:
+            return
+
+        current_version = self.get_setup_version()
+        if current_version >= self.module.version:
+            return
+
+        self.exception = None
+        self.current_operation = None
+        self.is_finished = False
+        try:
+            if hasattr(self.module, 'setup'):
+                logger.info('Running module setup - %s', self.module_name)
+                self.module.setup(self, old_version=current_version)
+            else:
+                logger.info('Module does not require setup - %s',
+                            self.module_name)
+        except Exception as exception:
+            logger.exception('Error running setup - %s', exception)
+            raise exception
+        else:
+            self.set_setup_version(self.module.version)
+        finally:
+            self.is_finished = True
+            self.current_operation = None
+
+    def install(self, package_names):
+        """Install a set of packages marking progress."""
+        logger.info('Running install for module - %s, packages - %s',
+                    self.module_name, package_names)
+        transaction = package.Transaction(package_names)
+        self.current_operation = {
+            'step': 'install',
+            'transaction': transaction,
+        }
+
+        transaction.install()
+
+    def call(self, step, method, *args, **kwargs):
+        """Call an arbitrary method during setup and note down its stage."""
+        logger.info('Running step for module - %s, step - %s',
+                    self.module_name, step)
+        self.current_operation = {'step': step}
+        return method(*args, **kwargs)
+
+    def get_state(self):
+        """Return whether the module is not setup or needs upgrade."""
+        current_version = self.get_setup_version()
+        if current_version and self.module.version <= current_version:
+            return 'up-to-date'
+
+        # If a module need installing/updating but no setup method is
+        # available, then automatically set version.
+        #
+        # Minor violation of 'get' only discipline for convenience.
+        if not hasattr(self.module, 'setup'):
+            self.set_setup_version(self.module.version)
+            return 'up-to-date'
+
+        if not current_version:
+            return 'needs-setup'
+        else:
+            return 'needs-update'
+
+    def get_setup_version(self):
+        """Return the setup version of a module."""
+        # XXX: Optimize version gets
+        from . import models
+
+        try:
+            module_entry = models.Module.objects.get(pk=self.module_name)
+            return module_entry.setup_version
+        except models.Module.DoesNotExist:
+            return 0
+
+    def set_setup_version(self, version):
+        """Set a module's setup version."""
+        from . import models
+
+        models.Module.objects.update_or_create(
+            pk=self.module_name, defaults={'setup_version': version})
+
+
+def init(module_name, module):
+    """Create a setup helper for a module for later use."""
+    if not hasattr(module, 'setup_helper'):
+        module.setup_helper = Helper(module_name, module)
+
+
+def setup_all_modules(essential=False):
+    """Run setup on all essential modules and exit."""
+    logger.info('Running setup for all modules, essential - %s', essential)
+    for module_name, module in plinth.module_loader.loaded_modules.items():
+        if essential and not getattr(module, 'is_essential', False):
+            continue
+
+        module.setup_helper.run()
diff --git a/plinth/templates/app.html b/plinth/templates/app.html
new file mode 100644
index 000000000..023171c08
--- /dev/null
+++ b/plinth/templates/app.html
@@ -0,0 +1,33 @@
+{% extends "base.html" %}
+{% comment %}
+#
+# This file is part of Plinth.
+#
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU Affero General Public License as
+# published by the Free Software Foundation, either version 3 of the
+# License, or (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU Affero General Public License for more details.
+#
+# You should have received a copy of the GNU Affero General Public License
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+#
+{% endcomment %}
+
+{% load i18n %}
+
+{% block content %}
+  <h2>{{ title }}</h2>
+
+  {% for paragraph in description %}
+    <p>{{ paragraph|safe }}</p>
+  {% endfor %}
+
+  {% block configuration %}
+  {% endblock %}
+
+{% endblock %}
diff --git a/plinth/templates/package_install.html b/plinth/templates/package_install.html
deleted file mode 100644
index 7df7bb8c6..000000000
--- a/plinth/templates/package_install.html
+++ /dev/null
@@ -1,94 +0,0 @@
-{% extends "base.html" %}
-{% comment %}
-#
-# This file is part of Plinth.
-#
-# This program is free software: you can redistribute it and/or modify
-# it under the terms of the GNU Affero General Public License as
-# published by the Free Software Foundation, either version 3 of the
-# License, or (at your option) any later version.
-#
-# This program is distributed in the hope that it will be useful,
-# but WITHOUT ANY WARRANTY; without even the implied warranty of
-# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-# GNU Affero General Public License for more details.
-#
-# You should have received a copy of the GNU Affero General Public License
-# along with this program.  If not, see <http://www.gnu.org/licenses/>.
-#
-{% endcomment %}
-
-{% load bootstrap %}
-{% load i18n %}
-
-{% block page_head %}
-
-  {% if is_installing %}
-    <meta http-equiv="refresh" content="3" />
-  {% endif %}
-
-{% endblock %}
-
-
-{% block content %}
-
-  <h2>{% trans "Installation" %}</h2>
-
-  {% if not is_installing %}
-
-    <p>
-      {% blocktrans trimmed %}
-        This feature requires addtional packages to be installed.  Do
-        you wish to install them?
-      {% endblocktrans %}
-    </p>
-
-    <table class="table">
-      <thead>
-        <tr>
-          <th>{% trans "Package" %}</th>
-          <th>{% trans "Summary" %}</th>
-        </tr>
-      </thead>
-      <tbody>
-        {% for package_name, package in packages.items %}
-          <tr>
-            <td>{{ package_name }}</td>
-            <td>{{ package.get_summary }}</td>
-          </tr>
-        {% endfor %}
-      </tbody>
-    </table>
-
-    <form action="" method="post">
-      {% csrf_token %}
-
-      <input type="submit" class="btn btn-md btn-primary"
-             value="{% trans "Install" %}" />
-    </form>
-
-  {% else %}
-
-    {% for key, transaction in transactions.items %}
-      <div>
-        {% blocktrans trimmed with package_names=transaction.package_names|join:", " status=transaction.status_string %}
-          Installing {{ package_names }}: {{ status }}
-        {% endblocktrans %}
-      </div>
-      <div class="progress">
-        <div class="progress-bar progress-bar-striped active"
-             role="progressbar" aria-valuemin="0" aria-valuemax="100"
-             aria-valuenow="{{ transaction.percentage }}"
-             style="width: {{ transaction.percentage }}%">
-          <span class="sr-only">
-            {% blocktrans trimmed with percentage=transaction.percentage %}
-              {{ percentage }}% complete
-            {% endblocktrans %}
-          </span>
-        </div>
-      </div>
-    {% endfor %}
-
-  {% endif %}
-
-{% endblock %}
diff --git a/plinth/templates/setup.html b/plinth/templates/setup.html
new file mode 100644
index 000000000..4cd25ee0f
--- /dev/null
+++ b/plinth/templates/setup.html
@@ -0,0 +1,101 @@
+{% extends "base.html" %}
+{% comment %}
+#
+# This file is part of Plinth.
+#
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU Affero General Public License as
+# published by the Free Software Foundation, either version 3 of the
+# License, or (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU Affero General Public License for more details.
+#
+# You should have received a copy of the GNU Affero General Public License
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+#
+{% endcomment %}
+
+{% load bootstrap %}
+{% load i18n %}
+
+{% block page_head %}
+
+  {% if setup_helper.current_operation %}
+    <meta http-equiv="refresh" content="3" />
+  {% endif %}
+
+{% endblock %}
+
+
+{% block content %}
+
+  <h2>{% trans "Installation" %}: {{ setup_helper.module.title }}</h2>
+
+  {% for paragraph in setup_helper.module.description %}
+    <p>{{ paragraph|safe }}</p>
+  {% endfor %}
+
+  {% if not setup_helper.current_operation %}
+
+    {% if setup_helper.get_state == 'needs-setup' %}
+      <p>
+        {% blocktrans trimmed %}
+          Install this application?
+        {% endblocktrans %}
+      </p>
+
+      <form action="" method="post">
+        {% csrf_token %}
+
+        <input type="submit" class="btn btn-md btn-primary"
+               value="{% trans "Install" %}" />
+      </form>
+    {% elif setup_helper.get_state == 'needs-update' %}
+      <p>
+        {% blocktrans trimmed %}
+          This application needs an update. Update now?
+        {% endblocktrans %}
+      </p>
+
+      <form action="" method="post">
+        {% csrf_token %}
+
+        <input type="submit" class="btn btn-md btn-primary"
+               value="{% trans "Update" %}" />
+      </form>
+    {% endif %}
+
+  {% else %}
+
+    {% if setup_helper.current_operation.step == 'pre' %}
+      {% trans "Performing pre-install operation" %}
+    {% elif setup_helper.current_operation.step == 'post' %}
+      {% trans "Performing post-install operation" %}
+    {% elif setup_helper.current_operation.step == 'install' %}
+      {% with transaction=setup_helper.current_operation.transaction %}
+        <div>
+          {% blocktrans trimmed with package_names=transaction.package_names|join:", " status=transaction.status_string %}
+            Installing {{ package_names }}: {{ status }}
+          {% endblocktrans %}
+        </div>
+        <div class="progress">
+          <div class="progress-bar progress-bar-striped active"
+               role="progressbar" aria-valuemin="0" aria-valuemax="100"
+               aria-valuenow="{{ transaction.percentage }}"
+               style="width: {{ transaction.percentage }}%">
+            <span class="sr-only">
+              {% blocktrans trimmed with percentage=transaction.percentage %}
+                {{ percentage }}% complete
+              {% endblocktrans %}
+            </span>
+          </div>
+        </div>
+      {% endwith %}
+    {% endif %}
+
+  {% endif %}
+
+{% endblock %}
diff --git a/plinth/urls.py b/plinth/urls.py
index 5ab1c866e..44be0a509 100644
--- a/plinth/urls.py
+++ b/plinth/urls.py
@@ -19,10 +19,9 @@
 Django URLconf file containing all urls
 """
 
-from django.conf.urls import patterns, url
+from django.conf.urls import url
+from . import views
 
-
-urlpatterns = patterns(  # pylint: disable-msg=C0103
-    'plinth.views',
-    url(r'^$', 'index', name='index')
-)
+urlpatterns = [
+    url(r'^$', views.index, name='index')
+]
diff --git a/plinth/views.py b/plinth/views.py
index cfbbd608b..a5b9a7680 100644
--- a/plinth/views.py
+++ b/plinth/views.py
@@ -22,8 +22,7 @@ Main Plinth views
 from django.core.urlresolvers import reverse
 from django.http.response import HttpResponseRedirect
 from django.views.generic import TemplateView
-
-from plinth import package as package_module
+import time
 
 
 def index(request):
@@ -31,33 +30,26 @@ def index(request):
     return HttpResponseRedirect(reverse('apps:index'))
 
 
-class PackageInstallView(TemplateView):
-    """View to prompt and install packages."""
-    template_name = 'package_install.html'
+class SetupView(TemplateView):
+    """View to prompt and setup applications."""
+    template_name = 'setup.html'
 
     def get_context_data(self, **kwargs):
         """Return the context data rendering the template."""
-        context = super(PackageInstallView, self).get_context_data(**kwargs)
-
-        if 'packages_names' not in context:
-            context['package_names'] = self.kwargs.get('package_names', [])
-        context['packages'] = {
-            package_name: package_module.packages_resolved[package_name]
-            for package_name in context['package_names']}
-        context['is_installing'] = \
-            package_module.is_installing(context['package_names'])
-        context['transactions'] = package_module.transactions
-
+        context = super(SetupView, self).get_context_data(**kwargs)
+        context['setup_helper'] = self.kwargs['setup_helper']
         return context
 
     def post(self, *args, **kwargs):
-        """Handle installing packages
+        """Handle installing/upgrading applications.
 
-        Start the package installation, and refresh the page every x seconds to
-        keep displaying PackageInstallView.get() with the installation status.
+        Start the application setup, and refresh the page every few
+        seconds to keep displaying the status.
         """
-        package_module.start_install(
-            self.kwargs['package_names'],
-            before_install=self.kwargs.get('before_install'),
-            on_install=self.kwargs.get('on_install'))
+        self.kwargs['setup_helper'].run_in_thread()
+
+        # Give a moment for the setup process to start and show
+        # meaningful status.
+        time.sleep(1)
+
         return self.render_to_response(self.get_context_data())