Grub doesn't include other HD in list

[Tom H]

On Fri, May 21, 2010 at 8:25 PM, Gabriel S. Coonce
<Gabriel.Coonce at fpsk12.org> wrote:
>>
>> I'm on an Ubuntu 10.04 64-bit install. On one 500GB HD I have Vista
>> and 10.04. On a seperate 40GB HD I have Ubuntu 9.10 32-bit. Grub is
>> installed on the 500GB HD. But, on it's boot list, all I see are
>> 10.04 ( and it's kernels and recovery modes), memtest, and Vista. I
>> don't see any 9.10 installs. However, a "ls" command at grub command
>> prompt showed two hard drives. What's going on?

https://bugs.edge.launchpad.net/ubuntu/+source/ubiquity/+bug/570765

How recent is your install CD? As you can see in the lnk above, the
first isos of 10.04 had a problem detecting other OSs. Although this
might not be your exact problem given that grub can detect Vista, have
yourun "aptitude update && aptitude full-upgrade" and "update-grub"?

Can you boot into your 9.10 install from the grub cli - since you see
the 9.10 disk?