update-manager could not calculate update

[Denis White]

Message when attemping update:

"Could not calculate the upgrade

An unresolvable problem occurred while calculating the upgrade.

Please report this bug against the 'update-manager' package and include the following error message:
'E:Error, pkgProblemResolver::Resolve generated breaks, this may be caused by held packages.' "

> uname -a
Linux ub2 3.2.0-27-generic-pae #43-Ubuntu SMP Fri Jul 6 15:06:05 UTC 2012 i686 i686 i386 GNU/Linux

From Sysinfo: Ubuntu 12.04 (precise)

ProblemType: Bug
DistroRelease: Ubuntu 12.04
Package: update-manager 1:0.156.14.6
ProcVersionSignature: Ubuntu 3.2.0-27.43-generic-pae 3.2.21
Uname: Linux 3.2.0-27-generic-pae i686
ApportVersion: 2.0.1-0ubuntu12
Aptdaemon:
 Aug 19 12:17:22 ub2 AptDaemon: INFO: Initializing daemon
 Aug 19 12:17:23 ub2 AptDaemon.PackageKit: INFO: Initializing PackageKit compat layer
 Aug 19 12:22:23 ub2 AptDaemon: INFO: Quitting due to inactivity
 Aug 19 12:22:23 ub2 AptDaemon: INFO: Quitting was requested
Architecture: i386
Date: Sun Aug 19 12:26:15 2012
PackageArchitecture: all
ProcEnviron:
 LANGUAGE=en_US:en
 PATH=(custom, no user)
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SourcePackage: update-manager
UpgradeStatus: Upgraded to precise on 2012-05-03 (107 days ago)

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.