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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).

Kalle Richter
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In parted and GParted, an ESP is identified by a "boot flag," but there's no such thing as an "esf flag" in either program. Thus, it's unclear to me what you mean by that. Please check it and report the actual "flags" set. It's unlikely that this detail is directly related to your problem, but it might be.

AFAIK, current versions of GRUB should recognize older Ubuntu installations. If yours is not doing so, you should consider filing a bug report. A post here does not qualify, since it will be sheer chance if the right Ubuntu developer sees a post here.

One possible legitimate reason that auto-detection might not be working is that your older installations might be missing or damaged. You should post a link to the RESULTS.txt file generated by Boot Info Script (installable as boot-info-script in Ubuntu) so that others can examine your configuration for evidence that this is or is not the case.

Two alternatives occur to me if you're having problems with auto-detection of OSes that are actually present:

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Rod Smith
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