how do I setup a Ubuntu domU guest on a CentOS / Fedora Core XEN server?

Hi all,

Does anyone know how to install Ubuntu (either 7.10 or 8.04) as a XEN domU guest on a CentOS 5 / Fedora Core 8 XEN dom0 server?

I have tried installing Ubuntu as a fully virtualized guest, but the Ubuntu CD doesn't even bootup. I get the Linux bootloader, and that's it,it doesn't continue to boot. Odd.

When trying to install a Paravirtualized guest, I had to use the debootstrap method, but can't get it to boot up.

Code:

xm create anya_zanet
Using config file "/etc/xen/anya_zanet".
Error: (2, 'Invalid kernel', 'xc_dom_find_loader: no loader found\n')

This is the /etc/xen/anya_zanet config:

Code:

kernel = "/boot/vmlinuz-2.6.23.1-42.fc8"
ramdisk = "/boot/initrd-2.6.23.1-42.fc8.img"
builder='linux'
memory = 256
name = "anya_zanet"
vcpus = 1
vif = [ 'bridge=xenbr0' ]
disk = [ 'phy:/dev/System/anya_zanet,hda1,w' ,  'phy:/dev/System/anya_zanet,hda2,w' ]
root = "/dev/hda1 ro"
on_poweroff = 'destroy'
on_reboot   = 'restart'
on_crash    = 'restart'