[Bug 987354] Re: error: no such partition. grub-pc fails to detect mdraid partitions

[Alex]

This also happens without md-raid. I have a normal Ubuntu installation
on sdb. I just upgraded and got the same error. Grub is unable to find
the partitions.

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https://bugs.launchpad.net/bugs/987354

Title:
  error: no such partition. grub-pc fails to detect mdraid partitions

Status in “grub2” package in Ubuntu:
  Confirmed
Status in “grub2” package in Debian:
  New

Bug description:
  After upgrading Oneiric to Precise on a 32-bit server that has md-raid
  mirrored boot drives using:

  do-release-upgrade -d

  On reboot GRUB2 totally fails to find its 2nd stage files. It reports:

  error: no such partition

  This also happens when entering the rescue command-line and trying to
  do operations such as:

  grub> ls
  error: no such partition

  Initial inspection of the grub environment indicates the UUIDs and
  grub prefix are as they were prior to the update.

  It is not possible to do anything with GRUB2 that requires it to
  find/load second stage files - which puts most of its command-line
  tools out of reach.

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