Until 13.10 and the grub2
version used there (version number is 2.02~beta2-... since years/multiple Ubuntu releases) parallel Ubuntu installations on other partitions (both with and without separate boot partitions, both with EFI and legacy BIOS) where recognized and available for multiboot. This is no longer the case. What is the criteria to make update-grub
/grub-probe -t device /boot/grub
recognize partitions again?
My current setup is having an EFI System Partition (ESF) with boot
and esf
flag set and different /boot/
partitions (ext4
) and different OS/root partitions (ext4
and btrfs
with Linux different derivates (Ubuntu, Debian, Fedora) installed).