Comment 13 for bug 759545

im still having this issue while updating maverick to natty on amazon ec2 :

ubuntu@ip-10-134-146-53:/var/www$ sudo update-grub
Generating grub.cfg ...
/usr/sbin/grub-probe: warn: disk does not exist, so falling back to partition device /dev/sda1.
/usr/sbin/grub-probe: warn: disk does not exist, so falling back to partition device /dev/sda1.
/usr/sbin/grub-probe: warn: disk does not exist, so falling back to partition device /dev/sda1.
/usr/sbin/grub-probe: warn: disk does not exist, so falling back to partition device /dev/sda1.
/usr/sbin/grub-probe: warn: disk does not exist, so falling back to partition device /dev/sda1.
/usr/sbin/grub-probe: warn: disk does not exist, so falling back to partition device /dev/sda1.
/usr/sbin/grub-probe: warn: disk does not exist, so falling back to partition device /dev/sda1.
/usr/sbin/grub-probe: warn: disk does not exist, so falling back to partition device /dev/sda1.
/usr/sbin/grub-probe: warn: disk does not exist, so falling back to partition device /dev/sda1.
Found linux image: /boot/vmlinuz-2.6.38-11-virtual
Found initrd image: /boot/initrd.img-2.6.38-11-virtual
/usr/sbin/grub-probe: warn: disk does not exist, so falling back to partition device /dev/sda1.
/usr/sbin/grub-probe: warn: disk does not exist, so falling back to partition device /dev/sda1.
/usr/sbin/grub-probe: warn: disk does not exist, so falling back to partition device /dev/sda1.
/usr/sbin/grub-probe: warn: disk does not exist, so falling back to partition device /dev/sda1.
Found linux image: /boot/vmlinuz-2.6.35-24-virtual
Found initrd image: /boot/initrd.img-2.6.35-24-virtual
/usr/sbin/grub-probe: warn: disk does not exist, so falling back to partition device /dev/sda1.
/usr/sbin/grub-probe: warn: disk does not exist, so falling back to partition device /dev/sda1.
/usr/sbin/grub-probe: warn: disk does not exist, so falling back to partition device /dev/sda1.
/usr/sbin/grub-probe: warn: disk does not exist, so falling back to partition device /dev/sda1.
/usr/sbin/grub-probe: warn: disk does not exist, so falling back to partition device /dev/sda1.
Found memtest86+ image: /boot/memtest86+.bin
done