Comment 7 for bug 84672

For anyone finding this bug, the fix in bug #38409 (restoring the edgy workaround) makes the immediate problem go away.

However, the udev rules have changed since that bug - the workaround simply tells udev to ignore any devices starting with dm-, whereas the correct fix lies with feisty's udev rules specifically for LVM in 65-persistent-storage.rules and 70-lvm.rules.