[Bug 563895] [NEW] grub2 fails to boot or install when an LVM snapshot exists

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SRU Justification:

Impact: When /boot and / are in an LVM VG and a snapshot is made of an
LVM LV in that VG the system will not boot and grub can not be modified
(updated, reinstalled.)

Testcase:

Binary package hint: grub2

Steps to reproduce:

- (Lucid beta2 installed from CD)
- Take a snapshot of any volume
- on reboot:
  error: fd0 read error.
  error: no such disk.
  grub rescue>
- Use the rescue cd to get a root shell
- Remove the snapshot and reboot
Now, the system boots. Create a new snapshot to repeat.

The system has 2 SATA disks in mdadm RAID1 configuration with 1 lvm
volume on top and no 'normal' partitions.

Also see Comment #6
https://bugs.launchpad.net/ubuntu/+source/grub2/+bug/563895/comments/6

Fix: See debdiff patch

** Affects: grub2 (Ubuntu)
     Importance: High
         Status: Fix Released

** Affects: grub2 (Debian)
     Importance: Unknown
         Status: Fix Released


** Tags: lucid testcase ubuntu-boot-experience
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grub2 fails to boot or install when an LVM snapshot exists
https://bugs.launchpad.net/bugs/563895
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