Fail to upgrade from 10.04 to 12.04

[Pasi Karhunen]

When trying to update from 10.04 to 12.04 with update manager everything goes fine, until the system stops upgrading.
Error message says that either I am upgrading from or to an unsupported version, or I have non-standard packages.

I have uninstalled every package installed locally or from universe sources, but to no help.

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

ProblemType: Bug
DistroRelease: Ubuntu 10.04
Package: update-manager 1:0.134.12.1
ProcVersionSignature: Ubuntu 2.6.32-44.98-generic 2.6.32.59+drm33.24
Uname: Linux 2.6.32-44-generic i686
Architecture: i386
Date: Sat Nov 3 17:16:44 2012
GConfNonDefault:
 /apps/update-manager/check_new_release_ignore=
 /apps/update-manager/first_run=false
 /apps/update-manager/show_details=false
 /apps/update-manager/show_versions=false
 /apps/update-manager/window_size=(600,600)
InstallationMedia: Ubuntu 10.04.4 LTS "Lucid Lynx" - Release i386 (20120214.2)
PackageArchitecture: all
ProcEnviron:
 LANG=fi_FI.utf8
 SHELL=/bin/bash
SourcePackage: update-manager
VarLogDistupgradeAptclonesystemstate.tar.gz: Error: [Errno 13] Lupa evätty: '/var/log/dist-upgrade/apt-clone_system_state.tar.gz'
VarLogDistupgradeTermlog:

[dino99 (9d9)]

This version is no more supported