SUMMARY
Currently, when selecting shutdown with offline updates pending, the system shuts down without installing the updates and the updates are just installed during next boot.
Instead, when selecting shutdown and offline updates pending, the system should reboot to install the updates and then shutdown. This way, the system is actually usable when booting it the next time instead of sitting in front of an update screen and not being able to do anything productive and getting as angry on Linux for updating in the worst possible moment as on Windows.