update-grub help

[Dave Howorth]

I have a machine with karmic on it and karmic's grub2 is installed in
the MBR.

I installed openSUSE 11.2 to another partition and told it to put its
legacy grub in the root partition. The opensuse system itself now runs
OK and I'm trying to set up the boot arrangements.

When I reboot, it picks up grub2 and boots into Ubuntu, which is fine
and what I expected. So I now want to add the opensuse grub to the
Ubuntu grub menu. My initial reading suggested that I should let the
system do the work via update-grub. But when I run it, I see an error:

# sudo update-grub
Generating grub.cfg ...
Found linux image: /boot/vmlinuz-2.6.31-21-server
Found initrd image: /boot/initrd.img-2.6.31-21-server
Found linux image: /boot/vmlinuz-2.6.31-20-server
Found initrd image: /boot/initrd.img-2.6.31-20-server
Found linux image: /boot/vmlinuz-2.6.31-14-server
Found initrd image: /boot/initrd.img-2.6.31-14-server
Found memtest86+ image: /memtest86+.bin
Found openSUSE 11.2 (x86_64) on /dev/sdf1
grub-probe: error: Cannot find a GRUB drive for /dev/sdf1.  Check your
device.map.

grub-probe: error: Cannot find a GRUB drive for /dev/sdf1.  Check your
device.map.

done

Does anybody have an idea what's wrong or got an alternative suggestion?

Thanks, Dave