Comment 1 for bug 532729

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Richard Laysell (ubuntu-bugs-ailanthus) wrote :

The underlying problem is that the /boot/grub/device.map file was missing

Managed to get this working by doing the following.

Boot from the CDROM and run 'Rescue a Broken System'
Run a shell on the root partition
Mount /boot and /var
Run the command '/usr/sbin/grub-mkdevicemap -n'
Run the command '/usr/sbin/grub-install /dev/sda'
Run the command '/usr/sbin/grub-install /dev/sdb' (for completeness - this is a mirrored system)
Run the command '/usr/sbin/update-grub2'

Reboot - and it all works