erro in update ubuntu 10.4 for 10.10

[Nb-Master]

Binary package hint: update-manager

I haver problem on update ubuntu, 32 bits 10.04 for 10.10, I change option ubuntu TSL for option Normal. The start the update, after 10 minutes the "update mananger" return:

Não foi possível calcular a atualização

An unresolvable problem occurred while calculating the upgrade:
E:Erro, pkgProblemResolver::Resolve gerou falhas, isto pode ser causado por pacotes mantidos (hold).

 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

Se nenhum deste se aplica, então por favor relate este erro sobre o pacote 'update-manager' e inclua os arquivos em /var/log/dist-upgrade/ no relatório de erro.

ProblemType: Bug
DistroRelease: Ubuntu 10.04
Package: update-manager 1:0.134.11
ProcVersionSignature: Ubuntu 2.6.32-28.55-generic 2.6.32.27+drm33.12
Uname: Linux 2.6.32-28-generic i686
Architecture: i386
Date: Fri Feb 4 22:29:39 2011
InstallationMedia: Ubuntu 10.04 LTS "Lucid Lynx" - Release i386 (20100429)
PackageArchitecture: all
ProcEnviron:
 LANGUAGE=pt_BR:pt:en
 LANG=pt_BR.UTF-8
 SHELL=/bin/bash
SourcePackage: update-manager

[RedSingularity (redsingularity)]

Duplicate of master bug 721306. Marking.