Some problematic computers rebooting can hang or freeze, so the solution is to add reboot=bios
or reboot=acpi
to the /etc/default/grub file and update grub after editing.
In openSUSE grub updage goes using command
sudo grub2-mkconfig -o /boot/grub2/grub.cfg
In Debian based systems it goes
sudo update-grub
Found from https://www.suse.com/support/kb/doc/?id=000017792