Traceback (most recent call last):
  File "/usr/lib/python2.7/site-packages/oblogout/__init__.py", line 354, in click_button
    self.dbus.restart()
  File "/usr/lib/python2.7/site-packages/oblogout/dbushandler.py", line 143, in restart
    if not self.__auth_perms("org.freedesktop.hal.power-management.reboot"):
  File "/usr/lib/python2.7/site-packages/oblogout/dbushandler.py", line 94, in __auth_perms
    if self.__check_perms(id):
  File "/usr/lib/python2.7/site-packages/oblogout/dbushandler.py", line 80, in __check_perms
    res = self._polkit.IsProcessAuthorized(id, os.getpid(), False)
  File "/usr/lib/python2.7/site-packages/oblogout/dbushandler.py", line 50, in _polkit
    pk = self._sysbus.get_object ("org.freedesktop.PolicyKit", "/")
  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.ServiceUnknown: The name org.freedesktop.PolicyKit was not provided by any .service files