error fatal

Traceback (most recent call last):
  File "ubuntu-tweak.py", line 75, in <module>
    launcher = TweakLauncher()
  File "ubuntu-tweak.py", line 42, in __init__
    from mainwindow import MainWindow
  File "/usr/share/ubuntu-tweak/mainwindow.py", line 30, in <module>
    from common.canvas import RenderCell
  File "/usr/share/ubuntu-tweak/common/canvas.py", line 14, in <module>
    class RenderCell:
  File "/usr/share/ubuntu-tweak/common/canvas.py", line 15, in RenderCell
    font_name = StringSetting('/desktop/gnome/interface/font_name').get_string()
  File "/usr/share/ubuntu-tweak/common/settings.py", line 92, in __init__
    super(StringSetting, self).__init__(key, default)
  File "/usr/share/ubuntu-tweak/common/settings.py", line 51, in __init__
    self.__client.add_dir(self.dir, gconf.CLIENT_PRELOAD_NONE)
GError: Contatto col server di configurazione non riuscito; tra le possibili cause la necessità di abilitare il supporto TCP/IP per ORBit o la presenza di un vecchio blocco NFS causato da un crash del sistema. Consultare http://www.gnome.org/projects/gconf/ per ulteriori informazioni (dettagli - 1: Errore eseguendo il ping al server: IDL:omg.org/CORBA/COMM_FAILURE:1.0).