Comment 9 for bug 1636567

I ran into the same issue stacking in stable/newton in Ubuntu 16. Fixed it by running the following commands before running stack.sh. Hope it helps

sudo apt-get remove --purge -y libvirt*
sudo pip uninstall libvirt-python
sudo apt-get install -y libvirt0=1.3.1-1ubuntu10.10 libvirt-bin=1.3.1-1ubuntu10.10 libvirt-dev:amd64=1.3.1-1ubuntu10.10