See also https://bugs.launchpad.net/ubuntu/+source/grub2/+bug/681535/comments/2
1st I checked that '/usr/sbin/grub-probe --device /dev/md1 --target=drive' doesn't rise an error message. I have installed manually the following packages: dpkg -i grub-common_1.99~rc1-13ubuntu3_amd64.deb grub-gfxpayload-lists_0.2_amd64.deb grub-pc_1.99~rc1-13ubuntu3_amd64.deb The problem doesn't appears any more. So please update also in lucid grub2 1.98 --> 1.99~20101126-1ubuntu1 (or newer) ** Changed in: grub2 (Ubuntu) Status: New => Confirmed -- 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