Just upgraded Ubuntu to 9.10; what a disaster! Screen goes black, and locks up! And looking at the forum I ain't the only one!

Now I have a duel hard drive boot system; Ubuntu on one, Kubuntu on t'other. I would like to back up my documents, photos, MP3s, browser bookmarks, and my cookies; then do a clean boot (have downloaded 9.10 {and 8.04 [just in case]}).

Only problem is; I cannot find the Ubuntu drive (even though it is connected to the same IDE cable), looking at the GRUB editor only the Kubuntu drive and 2 USB sticks can be seen, others are missing!