Lösung:
To re-enable os-prober, open a terminal with Ctrl+Alt+T, and run sudo nano /etc/default/grub to edit the grub-mkconfig configuration file. You will be asked for a password before the file opens, since you're opening it as a root user. Once the file is open, add GRUB_DISABLE_OS_PROBER=false to the file, press Ctrl+S to save, and Ctrl+X to exit. Finally, run sudo grub-mkconfig -o /boot/grub/grub.cfg to regenerate your GRUB configuration and boot menu, then type exit to leave the root shell. You can now close the terminal, and you should be done! Share Improve this answer Follow edited May 24 at 23:27
Lösung hätte Lösungsansatz sein heißen müssen, sorry.