Due to ongoing issue with virsh compiled against libvirt 0.7.5 when working with Xen 4.0 Hypervisor. I attempted to downgrade libvirt and related stuff to Ubuntu Karmic’s ( well tested version with Xen). Proceed as follows :-
1.Edit /etc/apt/sources.list
Replace:
deb http://us.archive.ubuntu.com/ubuntu/ lucid main restricted
deb-src http://us.archive.ubuntu.com/ubuntu/ lucid main restricted
by
deb http://us.archive.ubuntu.com/ubuntu/ karmic main restricted
deb-src http://us.archive.ubuntu.com/ubuntu/ karmic main restricted
Save
# apt-get update
# apt-get install ubuntu-virt-server ubuntu-virt-mgmt ( from Karmic main)
2. Rebuild and reinstall Xen 4.0 & Tools
3. Reboot