can't upgrade 11.04 to 11.10

[Juanjo del Pozo]

 (An unresolvable problem occurred while calculating the upgrade: E:Error, pkgProblemResolver::Resolve ha generat pauses, això pot haver estat causat per paquets retinguts. This can be caused by: * Upgrading to a pre-release version of Ubuntu * Running the current pre-release version of Ubuntu * Unofficial software packages not provided by Ubuntu Si cap d'aquestes s'aplica, llavors informeu d'aquest error utilitzant l'ordre «ubuntu-bug update-manager» en un terminal.)

ProblemType: Bug
DistroRelease: Ubuntu 11.04
Package: update-manager 1:0.150.5.1
ProcVersionSignature: Ubuntu 2.6.38-13.53-generic-pae 2.6.38.8
Uname: Linux 2.6.38-13-generic-pae i686
NonfreeKernelModules: nvidia
Architecture: i386
Date: Sun Dec 18 22:24:16 2011
GConfNonDefault:
 /apps/update-manager/check_new_release_ignore=natty
 /apps/update-manager/first_run=false
 /apps/update-manager/show_details=true
 /apps/update-manager/window_size=(600,600)
InstallationMedia: Ubuntu 10.10 "Maverick Meerkat" - Release i386 (20101007)
PackageArchitecture: all
ProcEnviron:
 LANGUAGE=ca_ES:en
 LANG=ca_ES.UTF-8
 SHELL=/bin/bash
SourcePackage: update-manager
UpgradeStatus: Upgraded to natty on 2011-12-18 (0 days ago)
VarLogDistupgradeApttermlog:

VarLogDistupgradeHistorylog:

VarLogDistupgradeSystemstatetargz:

VarLogDistupgradeTermlog:

[dino99 (9d9)]

That version is no more maintained