Error getting authority: Error initializing authority: Could not connect: Connection refused (g-io-error-quark, 39)
Further track, can be found through journalctl:
journalctl -xb
shows
Dec 09 09:37:47 beret.ethii.com NetworkManager[629]: <warn> [1512790667.5892] bus-manager: could not create org.freedesktop.DBus proxy (Error calling StartServiceByName for org.freedesktop.DBus: The connection is closed); only the private D-Bus socket will be availableDec 09 09:37:47 beret.ethii.com NetworkManager[629]: Error while sending AddMatch() message: The connection is closed
It basically means your dbus service is off or inactive. You may start the dbus to resolve the error
systemctl start dbus.service