Test:
- Downgrade kernel (linux-image-amd64) to earlier version.
- Reboot into the older kernel.
- Remove the newer kernel package.
- Run FreedomBox in develop mode.
- Run unattended-upgrades --debug to upgrade all packages.
- At the end a message is printed that shutdown is scheduled.
- Check /run/systemd/shutdown/scheduled file and see that microseconds since
epoch is set to tomorrow 02:00 local time.
Signed-off-by: Sunil Mohan Adapa <sunil@medhas.org>