Public bug reported:

When trying to upgrade to 12.04, the update manager fails and gives me
the following report:

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've checked the /var/log/dist-upgrade/apt.log file but there are a number of 
broken packages and I'm not sure which I need to remove. 
Some have mentioned removing the ‘libcv-dev’ package but I don't see that 
listed in the apt.log

ProblemType: Bug
DistroRelease: Ubuntu 10.04
Package: update-manager 1:0.134.12.1
ProcVersionSignature: Ubuntu 2.6.32-41.91-generic 2.6.32.59+drm33.24
Uname: Linux 2.6.32-41-generic i686
NonfreeKernelModules: wl
Architecture: i386
Date: Tue Jul 17 14:01:41 2012
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=(600,600)
InstallationMedia: Ubuntu 9.10 "Karmic Koala" - Release i386 (20091028.2)
PackageArchitecture: all
ProcEnviron:
 LANG=en_US.utf8
 SHELL=/bin/bash
SourcePackage: update-manager
VarLogDistupgradeTermlog:

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


** Tags: apport-bug dist-upgrade i386 lucid

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https://bugs.launchpad.net/bugs/1025812

Title:
  Cannot upgrade to 12.04

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