upgrade to 14.10 fails

[Erich C. Deise]

Upgrade from 14.04 to 14.10 produces this error quite early in the upgrade process.
I expected to be able to upgrade to 14.10 but instead received this error messaging ...
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

Thanks

ProblemType: Bug
DistroRelease: Ubuntu 14.04
Package: ubuntu-release-upgrader-core 1:0.220.5
ProcVersionSignature: Ubuntu 3.13.0-39.66-generic 3.13.11.8
Uname: Linux 3.13.0-39-generic x86_64
ApportVersion: 2.14.1-0ubuntu3.5
Architecture: amd64
CrashDB: ubuntu
CurrentDesktop: Unity
Date: Thu Oct 30 14:57:11 2014
InstallationDate: Installed on 2011-07-21 (1197 days ago)
InstallationMedia: Ubuntu 11.04 "Natty Narwhal" - Release amd64 (20110427.1)
PackageArchitecture: all
SourcePackage: ubuntu-release-upgrader
UpgradeStatus: Upgraded to trusty on 2014-10-30 (0 days ago)
VarLogDistupgradeTermlog:

modified.conffile..etc.update.manager.release.upgrades: [modified]
mtime.conffile..etc.update.manager.release.upgrades: 2014-10-30T14:42:45.713353