Traceback (most recent call last):
  File "/usr/lib/ubiquity/ubiquity/frontend/gtk_ui.py", line 1525, in on_back_clicked
    if ui.plugin_on_back_clicked():
  File "/usr/lib/ubiquity/plugins/ubi-wireless.py", line 151, in plugin_on_back_clicked
    self.nmwidget.disconnect_from_ap()
  File "/usr/lib/ubiquity/ubiquity/frontend/gtk_components/nmwidgets.py", line 336, in disconnect_from_ap
    self.view.disconnect_from_ap()
  File "/usr/lib/ubiquity/ubiquity/frontend/gtk_components/nmwidgets.py", line 164, in disconnect_from_ap
    self.wifi_model.disconnect_from_ap()
  File "/usr/lib/ubiquity/ubiquity/nm.py", line 186, in disconnect_from_ap
    self.manager.DeactivateConnection(self.active_connection)
  File "/usr/lib/python3/dist-packages/dbus/proxies.py", line 145, in __call__
    **keywords)
  File "/usr/lib/python3/dist-packages/dbus/connection.py", line 651, in call_blocking
    message, timeout)
dbus.exceptions.DBusException: org.freedesktop.NetworkManager.ConnectionNotActive: The connection was not active.