I am attempting to run an FC4 image on an FC5 machine I have prepped the image as per the FC4 quick start my xen config is as follows kernel ="/boot/vmlinuz-2.6.13-1.1532_FC4xenU" memory = 100 name = "vm01" vcpus = 1 vif= ['mac=FE:FD:25:63:74:49'] disk = [ 'file:/root/VM/fedora.img,sda1,w' ] root = "/dev/sda1" extra = "ro selinux=0 3" All I get is # xm create vm01 Using config file "vm01". Error: Error creating domain: (22, 'Invalid argument') Has anyone got a simple 1 NIC guest config for FC4 on FC5 I see that the new FC5 uses An init image as part of the boot A python based boot loader and a python based install script Is there any way to hack this lot to do an install like the FC5/FC5 one? How are the init images built? Will the new installer do other guest OS's in the future? Robert