Traceback (most recent call last):
  File "/usr/lib/ubiquity/plugins/ubi-wireless.py", line 86, in wireless_toggled
    self.state_changed(None, self.state)
  File "/usr/lib/ubiquity/plugins/ubi-wireless.py", line 132, in state_changed
    self.selection_changed(None)
  File "/usr/lib/ubiquity/plugins/ubi-wireless.py", line 74, in selection_changed
    if self.nmwidget.is_row_connected():
  File "/usr/lib/ubiquity/ubiquity/nm.py", line 358, in is_row_connected
    return self.view.is_row_connected()
  File "/usr/lib/ubiquity/ubiquity/nm.py", line 307, in is_row_connected
    if parent and self.wifi_model.is_connected(model[parent][0], ssid):
  File "/usr/lib/ubiquity/ubiquity/nm.py", line 88, in is_connected
    ssid = decode_ssid(get_prop(connect_obj, NM_AP, 'Ssid'))
  File "/usr/lib/ubiquity/ubiquity/nm.py", line 28, in get_prop
    return obj.Get(iface, prop, dbus_interface=dbus.PROPERTIES_IFACE)
  File "/usr/lib/python2.7/dist-packages/dbus/proxies.py", line 68, in __call__
    return self._proxy_method(*args, **keywords)
  File "/usr/lib/python2.7/dist-packages/dbus/proxies.py", line 143, in __call__
    **keywords)
  File "/usr/lib/python2.7/dist-packages/dbus/connection.py", line 630, in call_blocking
    message, timeout)
DBusException: org.freedesktop.DBus.Error.UnknownMethod: Method "Get" with signature "ss" on interface "org.freedesktop.DBus.Properties" doesn't exist