Comment 3 for bug 216176

Xen 3.4.1 Xen Dom0 ( with 2.6.31-rc5 pvops) was setup top of Ubuntu 9.10 Server (alpha 4),been installed on bare metal. It appears to be known issue with Grub2 when loading Xen host and came up already on Debian Lenny.
In case of Ubuntu 9.10 Server Xen host loading started and dropped to grub prompt after gave up waiting for root device.
menuentry "Xen 3.4.1 Ubuntu 9.10" {
set root (hd0,1)
multiboot (hd0,1)/xen-3.4.gz
module (hd0,1)/vmlinuz-2.6.31-rc5 root=/dev/sda2 ro console=tty0
module (hd0,1)/initrd-2..6.31-rc5.img
}
generated via /etc/grub.d/40_custom editing and running update-grub
Directive "root=UUID=...." switched off via editing /etc/default/grub and update-grub run.
Seems to be Grub2's multiboot implementation issue.
Mikmak's packages 3.4.1 work fine on 9.04, but won't help much on 9.10 with Grub2 issue in place.