OP found a later version to be fixed. Requesting a backport to lucid of the "LVM-on-RAID probing fix" mentioned in the Debian changelog.
** Changed in: grub2 (Ubuntu) Importance: Undecided => Medium ** Changed in: grub2 (Ubuntu) Status: Confirmed => Fix Released -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/733116 Title: /usr/sbin/grub-probe: error: unknown filesystem. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/grub2/+bug/733116/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs