udiskie
Traceback (most recent call last):
  File "/usr/bin/udiskie-2.7", line 7, in <module>
    sys.exit(udiskie.mount.cli(sys.argv[1:]))
  File "/usr/lib/python2.7/site-packages/udiskie/mount.py", line 96, in cli
    mounter.mount_present_devices()
  File "/usr/lib/python2.7/site-packages/udiskie/mount.py", line 57, in mount_present_devices
    for device in udiskie.device.get_all(self.bus):
  File "/usr/lib/python2.7/site-packages/udiskie/device.py", line 70, in get_all
    udisks = bus.get_object(UDISKS_OBJECT, UDISKS_OBJECT_PATH)
  File "/usr/lib/python2.7/site-packages/dbus/bus.py", line 244, in get_object
    follow_name_owner_changes=follow_name_owner_changes)
  File "/usr/lib/python2.7/site-packages/dbus/proxies.py", line 241, in __init__
    self._named_service = conn.activate_name_owner(bus_name)
  File "/usr/lib/python2.7/site-packages/dbus/bus.py", line 183, in activate_name_owner
    self.start_service_by_name(bus_name)
  File "/usr/lib/python2.7/site-packages/dbus/bus.py", line 281, in start_service_by_name
    'su', (bus_name, flags)))
  File "/usr/lib/python2.7/site-packages/dbus/connection.py", line 630, in call_blocking
    message, timeout)
dbus.exceptions.DBusException: org.freedesktop.DBus.Error.Spawn.ExecFailed: Failed to execute program /usr/libexec/dbus-daemon-launch-helper: Success