[Bug 738297] Re: update-grub sets root= non-deterministic device

[Gregor Larson]

not seeing this problem any more. I suspect it is fixed by:
grub2 (1.99~rc1-6ubuntu1) natty; urgency=low

  * Resynchronise with Debian.  Remaining changes:
...
    - Apply Ubuntu GRUB Legacy changes to legacy update-grub script: title,
      recovery mode, quiet option, tweak how memtest86+ is displayed, and
      use UUIDs where appropriate.
...
 -- Colin Watson <cjwatson at ubuntu.com>  Fri, 25 Mar 2011 23:44:33 +0000


** Changed in: grub2 (Ubuntu)
       Status: New => Fix Released

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https://bugs.launchpad.net/bugs/738297

Title:
  update-grub sets root= non-deterministic device

Status in “grub2” package in Ubuntu:
  Fix Released

Bug description:
  Using wubi rev 197 I installed Ubuntu 10.10 from Windows XP.

  Hard drives and partitions:
  2 hard drives (one PATA 160GB, one SATA 500GB)
  disk 0 (PATA): Primary partition C: , NTFS, over the entire disk
  disk 1 (SATA): Primary partition E: , NTFS , 450 GB, the rest is unpartitioned

  Windows XP installed on C:

  Steps:
   - downloaded wubi 197
   - installed Ubuntu 10.10 on disk E:
   - reboot into Ubuntu
   - the installation is finished
   - another reboot into ubuntu
  ...

  Then I did an update ( apt-get upgrade) and after that I got the
  "/host/ubuntu/disks/root.disk missing" message on each boot and
  dropping to shell.

  It turns out the grub configuration changed from
  set root='(hd1,msdos1)'
  to
  set root='(hd0,msdos1)'

  and
  linux /boot/vmlinuz-2.6.35-22-generic root=/dev/sdb1 ...
  to
  linux /boot/vmlinuz-2.6.35-22-generic root=/dev/sda1 ...

  As the same error is printed for unclean NTFS (see bug 226622) and
  that Ubuntu leaves the NTFS partionion in unclean state after each
  shutdown (bug 733816), I first thought this is an issue with unclean
  FS...

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