Could not determine upgrade

[dmoreland]

Fails with unresolvable problem.

Upgrading from 12.04 LTS

I have eclipse development tools installed with WebSphere Application Server. Not sure if these qualify as unofficial software packages. Should I remove them and then upgrade?

ProblemType: Bug
DistroRelease: Ubuntu 12.04
Package: update-manager 1:0.156.14.13
ProcVersionSignature: Ubuntu 3.8.0-39.57~precise1-generic 3.8.13.20
Uname: Linux 3.8.0-39-generic x86_64
ApportVersion: 2.0.1-0ubuntu17.6
Architecture: amd64
Date: Sat Apr 26 16:35:20 2014
GsettingsChanges:
 com.ubuntu.update-manager first-run false
 com.ubuntu.update-manager launch-time 1398526377
 com.ubuntu.update-manager show-details true
 com.ubuntu.update-manager window-height 520
 com.ubuntu.update-manager window-width 609
InstallationMedia: Ubuntu 12.04.3 LTS "Precise Pangolin" - Release amd64 (20130820.1)
MarkForUpload: True
PackageArchitecture: all
ProcEnviron:
 LANGUAGE=en_GB:en
 TERM=xterm
 PATH=(custom, no user)
 LANG=en_GB.UTF-8
 SHELL=/bin/bash
SourcePackage: update-manager
Symptom: ubuntu-release-upgrader-core
UpgradeStatus: Upgraded to precise on 2014-04-26 (0 days ago)
VarLogDistupgradeTermlog: