issue upgrading from13.10 to 14.04

[Ben Power]

Hi,

I keep trying to upgrade to 14.04 from 13.10 but it comes up with the sane error no matter what I disable. I spoke to a friend who is quite handy with Ubuntu and he said it might be an issue with the wheezy package. I keep removing it from the other software sectio of settings where the ppa's are. I then go to upgrade and there is an error message saying;

Could not determine 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.

I then go back in to; settings/software & updates/ other software and wheezy is back in there...

Can anybody help? I also had the same thing happen when I was using terminal to upgrade through; sudo do-release-upgrade

ProblemType: Bug
DistroRelease: Ubuntu 13.10
Package: ubuntu-release-upgrader-core 1:0.205.6
ProcVersionSignature: Ubuntu 3.11.0-24.42-generic 3.11.10.11
Uname: Linux 3.11.0-24-generic x86_64
NonfreeKernelModules: nvidia
ApportVersion: 2.12.5-0ubuntu2.2
Architecture: amd64
CrashDB: ubuntu
Date: Wed Jul 16 16:16:57 2014
InstallationDate: Installed on 2014-03-22 (115 days ago)
InstallationMedia: Ubuntu 13.10 "Saucy Salamander" - Release amd64 (20131016.1)
MarkForUpload: True
PackageArchitecture: all
SourcePackage: ubuntu-release-upgrader
UpgradeStatus: Upgraded to saucy on 2014-07-16 (0 days ago)