Giver падает (Ubuntu 11.04)

[PYLK]~% giver        
[Debug]: PhotoService static constructor called
[Debug]: New GiverService was created
[Debug]: We have the port : 57522
[Debug]: About to create the Avahi client
[Debug]: Adding Avahi Service  _giver._tcp
[Debug]: Avahi Service  _giver._tcp is added
[Debug]: GiverService:OnEntryGroupStateChanged was called state: Registering
Exception in Gtk# callback delegate
  Note: Applications can use GLib.ExceptionManager.UnhandledException to handle the exception.
System.DllNotFoundException: libX11.so
  at (wrapper managed-to-native) Egg.TrayIcon:XInternAtom (intptr,string,bool)
  at Egg.TrayIcon.OnRealized () [0x00000] in <filename unknown>:0 
  at Gtk.Widget.realized_cb (IntPtr widget) [0x00000] in <filename unknown>:0 
   at GLib.ExceptionManager.RaiseUnhandledException(System.Exception e, Boolean is_terminal)
   at Gtk.Widget.realized_cb(IntPtr widget)
   at Gtk.Widget.gtk_widget_show_all(IntPtr )
   at Gtk.Widget.ShowAll()
   at Giver.Application.SetupTrayIcon()
   at Giver.Application.InitializeIdle()
   at GLib.Idle+IdleProxy.Handler()
   at Gtk.Application.gtk_main()
   at Gtk.Application.Run()
   at Gnome.Program.Run()
   at Giver.Application.StartMainLoop()
   at Giver.Application.Main(System.String[] args)

[PYLK]~% uname -a
Linux alpi-netbook 2.6.38-15-generic-pae #66-Ubuntu SMP Tue Aug 14 17:45:09 UTC 2012 i686 i686 i386 GNU/Linux