Comment 19 for bug 668043

@Mark,

The ppa at https://launchpad.net/~serge-hallyn/+archive/libvirt-mav has 64-bit versions as well. You should be able to just

sudo add-apt-repository ppa:serge-hallyn/libvirt-mav
sudo apt-get update
sudo apt-get -y dist-upgrade

to install them