14 LTS - 16 LTS Upgrade will not start

[MasterCATZ]

Calculating the changes

Could not calculate the upgrade

An unresolvable problem occurred while calculating the upgrade.

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

If none of this applies, then please report this bug using the
command 'ubuntu-bug ubuntu-release-upgrader-core' in a terminal.

Restoring original system state

Aborting
Reading package lists... Done
Building dependency tree
Reading state information... Done
Building data structures... Done

aio@aio:~$ uname -a
Linux aio 4.5.1-040501-generic #201604121331 SMP Tue Apr 12 17:33:29 UTC 2016 x86_64 x86_64 x86_64 GNU/Linux

LSB Version: core-2.0-amd64:core-2.0-noarch:core-3.0-amd64:core-3.0-noarch:core-3.1-amd64:core-3.1-noarch:core-3.2-amd64:core-3.2-noarch:core-4.0-amd64:core-4.0-noarch:core-4.1-amd64:core-4.1-noarch:security-4.0-amd64:security-4.0-noarch:security-4.1-amd64:security-4.1-noarch
Distributor ID: Ubuntu
Description: Ubuntu 14.04.4 LTS
Release: 14.04
Codename: trusty

apt was wiped clean , heaps of programs purged

ProblemType: Bug
DistroRelease: Ubuntu 14.04
Package: ubuntu-release-upgrader-core 1:0.220.8
Uname: Linux 4.5.1-040501-generic x86_64
ApportVersion: 2.14.1-0ubuntu3.20
Architecture: amd64
CrashDB: ubuntu
CurrentDesktop: Unity
Date: Wed Apr 20 13:17:35 2016
InstallationDate: Installed on 2013-07-18 (1006 days ago)
InstallationMedia: Ubuntu 13.04 "Raring Ringtail" - Release amd64 (20130424)
PackageArchitecture: all
SourcePackage: ubuntu-release-upgrader
UpgradeStatus: Upgraded to trusty on 2016-04-20 (0 days ago)

[Brian Murray (brian-murray)]

I tried upgrading after restoring the apt-clone file included in your bug report and was unable to recreate the upgrade failure. If you haven't already could you try upgrading again? Thanks in advance.

[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 package version numbers greater than the release to which you are upgrading. You can revert the PPA by installing the ppa-purge package from the official Ubuntu archive and then running 'sudo ppa-purge oibaf'. After that you try upgrading and again and if it still fails open a new bug report. Thanks and good luck!

[MasterCATZ (mastercatz)]

Thanks for still looking into it
that may have been what I did

I think I purged the entire system , upgraded then reinstalled all pre-installed packages

will see if Ubuntu 16.10 causes any upgrade problems next month