Upgrade to version 11.10 - Can not calculate the terms for the upgrade

[PauldeDigitect]

An unresolvable problem occurred while calculating the upgrade:
E:Fout, pkgProblemResolver::Resolve maakte scheidingen aan, dit kan veroorzaakt worden door vastgehouden pakketten.

Dutch translation "::Resolve makes separations, this can be caused by locked packets."

ProblemType: Bug
DistroRelease: Ubuntu 11.04
Package: update-manager 1:0.150.5
ProcVersionSignature: Ubuntu 2.6.38-12.51-generic 2.6.38.8
Uname: Linux 2.6.38-12-generic i686
NonfreeKernelModules: nvidia
Architecture: i386
Date: Sat Nov 19 11:47:54 2011
GConfNonDefault:
 /apps/update-manager/check_new_release_ignore=
 /apps/update-manager/first_run=false
 /apps/update-manager/show_details=true
 /apps/update-manager/window_size=(744,681)
PackageArchitecture: all
ProcEnviron:
 LANGUAGE=nl_NL:en
 LANG=nl_NL.UTF-8
 SHELL=/bin/bash
SourcePackage: update-manager
UpgradeStatus: Upgraded to natty on 2011-11-19 (0 days ago)
VarLogDistupgradeApttermlog:

VarLogDistupgradeHistorylog:

VarLogDistupgradeTermlog:

[dino99 (9d9)]

That version is no more maintained