E:Error, pkgProblemResolver::Resolve generated breaks, this may be caused by held packages

[a paliogi]

Binary package hint: update-notifier

distribution:ubuntu 10.10
Release:10.10

ProblemType: Bug
DistroRelease: Ubuntu 10.10
Package: update-notifier 0.105ubuntu1
ProcVersionSignature: Ubuntu 2.6.35-28.49-generic 2.6.35.11
Uname: Linux 2.6.35-28-generic i686
NonfreeKernelModules: nvidia
Architecture: i386
Date: Wed Apr 6 18:03:36 2011
ExecutablePath: /usr/bin/update-notifier
InstallationMedia: Ubuntu 10.04 LTS "Lucid Lynx" - Release i386 (20100429)
ProcEnviron:
 LANG=en_US.utf8
 SHELL=/bin/bash
SourcePackage: update-notifier
XsessionErrors:
 (polkit-gnome-authentication-agent-1:1855): GLib-CRITICAL **: g_once_init_leave: assertion `initialization_value != 0' failed
 (nautilus:1858): GConf-CRITICAL **: gconf_value_free: assertion `value != NULL' failed
 (nm-applet:1866): Gdk-CRITICAL **: IA__gdk_window_thaw_toplevel_updates_libgtk_only: assertion `private->update_and_descendants_freeze_count > 0' failed
Could not calculate the upgrade

An unresolvable problem occurred while calculating the upgrade.

Please report this bug against the 'update-manager' package and include the following error message:
'E:Error, pkgProblemResolver::Resolve generated breaks, this may be caused by held packages.'