Comment 2 for bug 16824

A friend had a similar problem. He has 3 hard drives. Ubuntu's installer
detects them in one order, grub detects them in a different order meaning grub
fails to boot ubuntu on a fresh install since it can't find the partition ubuntu
is on. A little fiddling around with the root hd(x,x) was able to find the
differing partition layout grub picks up to enable booting.

On his setup, a hard drive connected to the primary IDE channel which should be
/dev/hdb (slave on the primary channel) was coming up as /dev/hdc in ubuntu's
installer and a drive on the secondary channel which should be /dev/hdc came up
as /dev/hdb in the installer. So, when he installed linux an ext3 partition on
"/dev/hdc3", it needed a "root hd(1,2)" in grub to be booted, but the installer
put "root hd(2,2)" and that failed and got the error 22, no such partition error.

I might be able to get more details from his system later and might be able to
attach them to this bug report.