More GRUB pain 'n' gain: a tutorial explaining how to work around the issue of GRUB2 update command with rmdir & os-prober mount error resulting in partial or broken configuration, reboot and subsequent fixes, how to reinstall GRUB2 on EFI systems, other tips and tricks, and more. Have fun. http://www.dedoimedo.com/computers/grub2-ubuntu-rmdir-error.html Cheers, Mrk
