can't upgrade linux 10.04 to 12.04

[Manuel Peña]

the error says:

Its not posible calculate the upgrade.

An unresolvable problem occurred while calculating the upgrade:

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

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 provide by ubuntu

ProblemType: Bug
DistroRelease: Ubuntu 10.04
Package: update-manager 1:0.134.11.1
ProcVersionSignature: Ubuntu 2.6.32-38.83-generic 2.6.32.52+drm33.21
Uname: Linux 2.6.32-38-generic i686
Architecture: i386
Date: Thu Feb 2 14:52:32 2012
PackageArchitecture: all
ProcEnviron:
 LANG=es_ES.utf8
 SHELL=/bin/bash
SourcePackage: update-manager

[Jean-Baptiste Lallement (jibel)]

Thanks for taking the time to report this bug and helping to make Ubuntu better. Could you please add the log files from '/var/log/dist-upgrade/' to this bug report as separate attachments? Thanks in advance.

[Manuel Peña (manup2011)]

here i give you the attachments of logs in the dist-upgrade folder, your welcome! ^^

[Manuel Peña (manup2011)]

i can't upload term.log, because it tells that the file is empty :S

[dino99 (9d9)]

This version is no more supported