My setup was:
1) a new new SATA hdd on which there was a new xp install, and on which i was installing the 8.04 RC.
2) an old IDE drive from the old computer, on which i XPs and an older ubuntu
The install went quite smoothly, but the grub would not boot ubuntu. In fact, it mismatched the Hdd names
: it put hdd(1,x) instead of hdd (0,x). Quite curiously, it did it correctly for the XP partition on the new HDD, but wrongly on the ubuntu partitions.
I include the original menu.lst file. (is there any way of attaching two files here?). I replaced the hdd (1,x) by hdd (0,x) for the first drive boot options, the very way it is set up for the XP on the SATA drive from which it is supposed to boot. The system works now.
Actually, I installed the system twice. I had problems on both occasions. Earlier - around 20.04.2008, maybe it was an earlier Ubuntu 8.04 RC image? - I had very similar problems. The installer did not provide the correct boot partition description for the XPs on the SATA drive (which was the only I wanted to boot, anyhow).
Hope this helps,
IH
I attach the corected menu.lst