This started a long time ago, but every time I reboot the OS, or upgrade the OS version, I end up getting stuck on a GRUB screen and have to make a selection.
I have the same problem, each time I reboot with the app or update or in CLI, the boot sequence gets stuck at GNU GRUB. I even have to reboot the machine manually because it freezes at the GNU GRUB page. I always manage to reboot but its a PITA