Installed that as Xen DomU (fully virtualized - HVM) and it installs fine
and boots fine. Albeit the network seems to have gone away - had to run
/etc/init.d/network restart to get it back.
Install it as Xen DomU (PV) guest works now. Booting up the guest afterwards..
well that is a new bug :-)
# 745335 - pygrub cannot start F16 PV guests (GPT partition) under Xen 4.1.1