Public bug reported:

Received this error when trying to upgrade from Natty 11.04 to Oneiric.

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

This is from an Xubuntu desktop. I also have gnome and unity installed,
but don't use them. I expected a smooth upgrade.

ProblemType: Bug
DistroRelease: Ubuntu 11.04
Package: update-manager 1:0.150.5.2
ProcVersionSignature: Ubuntu 2.6.38-13.56-generic 2.6.38.8
Uname: Linux 2.6.38-13-generic i686
Architecture: i386
CheckboxSubmission: fd057b0bdea60eb17cdbf0a26f3fba5f
CheckboxSystem: 0531969bcfd4f03af7405c98dc94a948
Date: Sun Mar 18 20:25:52 2012
GConfNonDefault:
 /apps/update-manager/check_new_release_ignore=oneiric
 /apps/update-manager/first_run=false
 /apps/update-manager/show_details=true
 /apps/update-manager/window_size=(668,634)
PackageArchitecture: all
ProcEnviron:
 LANGUAGE=en_US:en
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SourcePackage: update-manager
UpgradeStatus: Upgraded to natty on 2012-03-19 (0 days ago)
VarLogDistupgradeApttermlog:
 
VarLogDistupgradeHistorylog:
 
VarLogDistupgradeTermlog:

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


** Tags: apport-bug i386 natty

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https://bugs.launchpad.net/bugs/958964

Title:
  distribution upgrade failure 11.04 to 11.10

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