GNU/Linux Desktop Survival Guide by Graham Williams
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Wajig Reboot

20200726 After an upgrade there may be times when a reboot is required (such as when the kernel is upgraded). We can check if a reboot is required by checking for the file /var/run/reboot-required which acts as a reboot flag. If it exists then the computer requires a reboot and the contents of the file /var/run/reboot-required.pkgs will ist the packages that necessitate the reboot.

Wajig can check the existence of the reboot flag with the reboot command:

$ wajig reboot
*** System restart required ***

The following packages necessitate the reboot:

  linux-image-5.4.0-42-generic
  linux-base
  evolution-data-server
  gnome-shell

To reboot use "sudo reboot".

To reboot a computer usually requires admin privileges, hence the use of sudo with the reboot command. Wajig itself will not reboot the computer.