upgrade failed

[Mike]

upgrading from 13.10 to 14.04 gets to second stage (new software channels) stops with message that error caused by pre-release versions or third-party package. Presumably it is a third-party package, but there is nothing very unusual on there that I know of. Anyway there is no way I can do anything without knowing what the offending package is, which means I must either get this fixed or move to a different OS.
I am not sure if this is a bug or I just need support, but the message said to report a bug so if it meant call support that is another reason to change operating systems.
As you may gather, as a long time user of Ubuntu and an IT professional I think this is really disgraceful.

ProblemType: Bug
DistroRelease: Ubuntu 13.10
Package: ubuntu-release-upgrader-core 1:0.205.6
ProcVersionSignature: Ubuntu 3.11.0-26.21-lowlatency 3.11.10.12
Uname: Linux 3.11.0-26-lowlatency i686
NonfreeKernelModules: nvidia
ApportVersion: 2.12.5-0ubuntu2.2
Architecture: i386
CrashDB: ubuntu
Date: Thu Oct 16 11:15:32 2014
InstallationDate: Installed on 2012-10-08 (737 days ago)
InstallationMedia: Ubuntu 12.04.1 LTS "Precise Pangolin" - Release i386 (20120817.3)
MarkForUpload: True
PackageArchitecture: all
SourcePackage: ubuntu-release-upgrader
UpgradeStatus: Upgraded to saucy on 2014-10-16 (0 days ago)
VarLogDistupgradeTermlog:

[Brian Murray (brian-murray)]

Reviewing the files from your upgrade attempt you seem to have enabled a PPA that provides Xorg packages. This will prevent the upgrade as that PPA contains different versions of packages essential to Ubuntu. The page, https://launchpad.net/~xorg-edgers/+archive/ppa, contains details on to how to revert to the official Xorg packages for the xorg-edgers PPA. Instructions for reverting to official Xorg packages should be similar for the PPA that you have enabled.