[Bug 960010] Re: [Precise] [Regression] Grub doesn't recognize other Linux distros anymore

[Swâmi Petaramesh]

This bug occurs on each and every machine which has several Linux
distros installed and is LVM-based.

Again, this is a regression - this didn't happen before Precise, and now
it happens with all other Linus distros that are Precise derivatives
(i.e. Mint 13, Voyager...)

I further noticed something :

- All other Linus distros ARE detected if their root FS is mounted
anywhere in the current Linux FS (i.e. MINT root FS mounted under
/mnt/MINT) at the time when "update-grub" is run.

- Oherwise (if not mounted) other distros stay undetected.

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https://bugs.launchpad.net/bugs/960010

Title:
  [Precise] [Regression] Grub doesn't recognize other Linux distros
  anymore

Status in “grub2” package in Ubuntu:
  Confirmed

Bug description:
  - Regression since latest grub2 updates on Precise Beta

  - Observed on 2 different machines.

  - Grub doesn't recognize the presence of other Linux distros on same
  machine anymore (it was working perfectly before) (There's a Mint
  /boot on /dev/sda6 here).

  - OTOH it identifies FreeBSD, which it didn't automagically do
  before...

  Grub now spits "no such disk" error that I had never seen before.

  Example:

  $ sudo update-grub
  [sudo] password......: 
  Generating grub.cfg ...
  Found linux image: /boot/vmlinuz-3.2.0-19-generic
  Found initrd image: /boot/initrd.img-3.2.0-19-generic
  Found linux image: /boot/vmlinuz-3.2.0-18-generic
  Found initrd image: /boot/initrd.img-3.2.0-18-generic
  Found memtest86+ image: /memtest86+.bin
  grub-probe : erreur : no such disk.
  grub-probe : erreur : no such disk.
  Found FreeBSD on /dev/sda1
  Found Windows Recovery Environment (loader) on /dev/sda3
  done

  ProblemType: Bug
  DistroRelease: Ubuntu 12.04
  Package: grub-pc 1.99-18ubuntu1
  ProcVersionSignature: Ubuntu 3.2.0-19.30-generic 3.2.11
  Uname: Linux 3.2.0-19-generic i686
  ApportVersion: 1.94.1-0ubuntu2
  Architecture: i386
  Date: Tue Mar 20 09:24:34 2012
  SourcePackage: grub2
  UpgradeStatus: Upgraded to precise on 2012-03-13 (7 days ago)

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