Comment 11 for bug 1802005

I was able to manually workaround this on Ubuntu 20.04 with the file from here:

https://wiki.libvirt.org/page/Networking#Using_NetworkManager_directly

And the solution from here:

https://github.com/cockpit-project/cockpit/issues/13343#issuecomment-570611574

```
# ======
# install cockpit on ubuntu 19.10
sudo apt-get install -y cockpit cockpit-machines libvirt-dbus

# fix for issue 'machines list is empty'
# https://github.com/cockpit-project/cockpit/issues/13343
sudo usermod -a -G libvirt libvirtdbus
sudo usermod -a -G libvirt libvirt-qemu

# must reboot (or restart the affected systemd services) for changes to take effect
```