Cannot perform "partial Upgrade" - Updates not possible

If I click on the update program (in dash) I get a warning that I cannot update. It recommends a partial upgrade but when I do, it doesn't upgrade.

I installed the Alpha version of 14.04 many weeks ago. I do not have the 'pre-release' updates enabled.

ProblemType: Bug
DistroRelease: Ubuntu 14.04
Package: ubuntu-release-upgrader-core 1:0.216
ProcVersionSignature: Ubuntu 3.13.0-17.37-generic 3.13.6
Uname: Linux 3.13.0-17-generic x86_64
ApportVersion: 2.13.3-0ubuntu1
Architecture: amd64
CrashDB: ubuntu
CurrentDesktop: Unity
Date: Wed Mar 12 08:07:04 2014
InstallationDate: Installed on 2014-02-07 (32 days ago)
InstallationMedia: Ubuntu 14.04 LTS "Trusty Tahr" - Alpha amd64 (20140207)
PackageArchitecture: all
SourcePackage: ubuntu-release-upgrader
UpgradeStatus: No upgrade log present (probably fresh install)