Re: GRUB booting from RAID1 is broken after Ubuntu update: how to recover?

[Andi Meier]

I fixed the boot issue by reinstalling grub using the instructions on 
http://wiki.ubuntuusers.de/grub_2/konfiguration

Because this page is German, I will describe in English what I did:

Basically I booted from "Ubuntu Rescue Remix 10.04" (from USB stick) into a 
command prompt and then:

  sudo mdadm --assemble /dev/md0 /dev/sda1 /dev/sdb1
  sudo mkdir /mnt
  sudo mount /dev/md0 /mnt

Now I could access my system partition (which was mounted on /).

Install package containing the command grub-install and reinstall GRUB by 
writing it to the MBRs of the RAID1 members:

  sudo apt-get install grub-pc
  sudo grub-install --root-directory=/mnt /dev/sda
  sudo grub-install --root-directory=/mnt /dev/sdb

After rebooting (works now!):

  sudo update-grub


The system seems to work right now, but I receive an error message while 
booting:

  udevd-work[121]: inotify_add_watch(6, /dev/sdb5, 10) failed: No such file or 
directory

  nForce2_smbus 0000:00:03.2: Error probing SMB1.

What does that mean? If I can fix this, then I consider my system being 
completely up and running again.

Thanks,
Andi