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

[S J Mongin]

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.'

ProblemType: Bug
DistroRelease: Ubuntu 12.04
Package: update-manager 1:0.156.14.9
ProcVersionSignature: Ubuntu 3.2.0-29.46-generic 3.2.24
Uname: Linux 3.2.0-29-generic i686
ApportVersion: 2.0.1-0ubuntu12
Aptdaemon:

Architecture: i386
Date: Wed Aug 15 07:43:33 2012
EcryptfsInUse: Yes
GsettingsChanges:
 com.ubuntu.update-manager first-run false
 com.ubuntu.update-manager launch-time 1345033705
 com.ubuntu.update-manager show-details true
 com.ubuntu.update-manager window-height 621
 com.ubuntu.update-manager window-width 600
PackageArchitecture: all
ProcEnviron:
 TERM=xterm
 PATH=(custom, no user)
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SourcePackage: update-manager
UpgradeStatus: Upgraded to precise on 2012-06-06 (69 days ago)