I've managed to reproduce this and am debugging.
** Changed in: grub2 (Ubuntu Natty)
Status: Triaged => In Progress-- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/732149 Title: [natty] btrfs "grub-probe: error: unknown filesystem" -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
