package gnome-screensaver 2.30.2-0ubuntu2 failed to install/upgrade: problemas de dependência - deixando desconfigurado

[Beto]

I tried to install the automatic updates from ubuntu, after a desinstalation of gnome 3.

ProblemType: Package
DistroRelease: Ubuntu 11.04
Package: gnome-screensaver 2.30.2-0ubuntu2
ProcVersionSignature: Ubuntu 2.6.38-13.54-generic 2.6.38.8
Uname: Linux 2.6.38-13-generic i686
NonfreeKernelModules: nvidia
Architecture: i386
Date: Sun Jan 29 13:57:19 2012
ErrorMessage: problemas de dependência - deixando desconfigurado
GconfGnomeSession:
 idle_delay = 5
  /desktop/gnome/session/required_components:
   windowmanager = gnome-wm
GnomeSessionIdleInhibited: Unknown
GnomeSessionInhibitors: Failed to acquire
InstallationMedia: Ubuntu 11.04 "Natty Narwhal" - Release i386 (20110427.1)
SourcePackage: gnome-screensaver
Title: package gnome-screensaver 2.30.2-0ubuntu2 failed to install/upgrade: problemas de dependência - deixando desconfigurado
UpgradeStatus: No upgrade log present (probably fresh install)
WindowManager: gnome-wm