if possible, could you please follow the steps in comment #40 and also comment out 'deny capability kill' in /etc/apparmor.d/abstractions/libvirt-qemu, restart libvirt (sudo stop libvirt-bin; sudo start libvirt-bin) or reboot, and see if that works for you?
It is possible that my failure is due to a change in 14.04.
@Brian,
if possible, could you please follow the steps in comment #40 and also comment out 'deny capability kill' in /etc/apparmor. d/abstractions/ libvirt- qemu, restart libvirt (sudo stop libvirt-bin; sudo start libvirt-bin) or reboot, and see if that works for you?
It is possible that my failure is due to a change in 14.04.