Otherwise nm-applet is not able to control NetworkManager over dbus, and
you get the following error messages:
```
(nm-applet:19808): nm-applet-WARNING **: 17:24:56.716: disconnect_cb: Device disconnect failed: (1) org.freedesktop.NetworkManager.network-control request failed: not authorized
```
This is unfortunate, but I don't see a better way around it.
See also: https://groups.google.com/d/topic/qubes-users/b_yEFCMazuM/discussion
2452042c66