Traceback (most recent call last):
  File "/usr/lib/ubiquity/ubiquity/nm.py", line 333, in __init__
    self.state_changed)
  File "/usr/lib/ubiquity/ubiquity/nm.py", line 216, in __init__
    self.wifi_model = NetworkManager(model, state_changed)
  File "/usr/lib/ubiquity/ubiquity/nm.py", line 61, in __init__
    self.start(state_changed)
  File "/usr/lib/ubiquity/ubiquity/nm.py", line 77, in start
    self.build_passphrase_cache()
  File "/usr/lib/ubiquity/ubiquity/nm.py", line 126, in build_passphrase_cache
    dbus_interface=NM_SETTINGS_CONN)
  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.NetworkManager.Settings.NotPrivileged: Insufficient privileges.