Debian also had this problem and resolved it by not converting /dev/mapper:
http://packages.debian.org/changelogs/pool/main/g/grub/grub_0.97-13/changelog.html#versionversion0.97-4 -- No need to convert LVM volumes to UUIDs https://launchpad.net/bugs/54002 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
