Public bug reported:

Update manager : Setting new software channels
=============================================================================================
Could not 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 provided by Ubuntu

If none of this applies, then please report this bug using the command 
'ubuntu-bug update-manager' in a terminal.
=============================================================================================

I am running the latest 10.04.4 LTS, trying to upgrade to 12.04 LTS

There is no log about an error or unofficial software package

Please help

ProblemType: Bug
DistroRelease: Ubuntu 10.04
Package: update-manager 1:0.134.12.1
ProcVersionSignature: Ubuntu 2.6.32-61.124-generic 2.6.32.62+drm33.26
Uname: Linux 2.6.32-61-generic x86_64
NonfreeKernelModules: nvidia
Architecture: amd64
Date: Wed Jun 11 09:09:40 2014
GConfNonDefault:
 /apps/update-manager/check_new_release_ignore=
 /apps/update-manager/first_run=false
 /apps/update-manager/show_versions=false
 /apps/update-manager/window_size=(1272,743)
PackageArchitecture: all
ProcEnviron:
 LANGUAGE=en_CA:en
 PATH=(custom, no user)
 LANG=en_CA.UTF-8
 SHELL=/bin/bash
SourcePackage: update-manager
VarLogDistupgradeAptclonesystemstate.tar.gz: Error: [Errno 13] Permission 
denied: '/var/log/dist-upgrade/apt-clone_system_state.tar.gz'
VarLogDistupgradeTermlog:

** Affects: update-manager (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug dist-upgrade lucid

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https://bugs.launchpad.net/bugs/1328907

Title:
  Could not calculate the upgrade

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