[libvirt] libvirtlight problem with Xen

[Eric]

I'm trying to use virt-manager with Xen.  My Dom0 is Debian 8.  When I 
create a DomU (Ubuntu Trusty) as a PV guest, the boot fails with an 
error saying that libvirtlight failed to connect.

The opinion from the virt-manager list group is that the problem is 
libvirt, not virt-manager.

I've googled around, and have seen old posts about this, but these seem 
to claim that the problem has resolved.

Solution?
Thanks
Eric