screensaver option

[Joie Cybersushi]

screen saver option missing in settings. or in power, or in screen,

ProblemType: Bug
DistroRelease: Ubuntu 11.10
Package: nautilus 1:3.1.92-0ubuntu2
ProcVersionSignature: Ubuntu 3.0.0-11.18-generic 3.0.4
Uname: Linux 3.0.0-11-generic i686
ApportVersion: 1.23-0ubuntu1
Architecture: i386
Date: Tue Oct 11 22:48:19 2011
ExecutablePath: /usr/bin/nautilus
InstallationMedia: Ubuntu 11.10 "Oneiric Ocelot" - Beta i386 (20110921.2)
ProcEnviron:
 LANGUAGE=es_MX:es
 PATH=(custom, no user)
 LANG=es_MX.UTF-8
 SHELL=/bin/bash
SourcePackage: nautilus
UpgradeStatus: No upgrade log present (probably fresh install)
XsessionErrors:
 (canberra-gtk-play:1261): Gtk-WARNING **: Imposible encontrar el motor de temas en la ruta al _modulo: «pixmap»,
 (gnome-settings-daemon:1134): GLib-CRITICAL **: g_variant_new_string: assertion `string != NULL' failed
 (unity-window-decorator:1383): Gtk-WARNING **: Imposible encontrar el motor de temas en la ruta al _modulo: «pixmap»,
 (applet.py:1494): Gtk-WARNING **: Imposible encontrar el motor de temas en la ruta al _modulo: «pixmap»,
 (firefox:1579): Gtk-WARNING **: Imposible encontrar el motor de temas en la ruta al _modulo: «pixmap»,