Hi Simon, After upgrading you may have option for grub legacy or grub2 for use. Please check which one you are using.You have to use command 'upgrade-from-grub-legacy' to use grub2 permanently. grub2 use file /boot/grub/grub.cfg and legacy file /boot/grub/menu.lst compare to use right device for root. /usr/share/doc/grub* may help you. Have fun regards, G.NATH