Comment 6 for bug 914788

It looks like this bug is back in some form for the 12.10 beta:

virt-install -n vi-test -r 512 --disk path=/vm/vi-test.img,size=4 -c /vm/iso/ubuntu-12.10-beta1-server-amd64.iso --network network=default --connect=xen:/// --vnc --noautoconsole -v

Starting install...
Creating storage file vi-test.img | 4.0 GB 00:00
ERROR POST operation failed: xend_post: error from xen daemon: (xend.err "Error creating domain: device model '/usr/lib/xen-default/bin/qemu-dm' not found")
Domain installation does not appear to have been successful.
If it was, you can restart your domain by running:
  virsh --connect xen:/// start vi-test
otherwise, please restart your installation.