I want to upgrade ubuntu 14.04 to 14.10, During setting new software channels, it shows that could not calcute the upgrade due to three reasons. The reasons are: 1. Upgrading to a pre-release version of Ubuntu, 2. Running the current pre-release version of Ubuntu, 3. Unofficial software packages not provided by Ubuntu

[Satyananda Champati Rai]

I want to upgrade ubuntu 14.04 to 14.10 and in the phase of setting new software channels the error message is could not calculate upgrade. The reasons are mentioned in the summary.

It is not proceeding from that point

ProblemType: Bug
DistroRelease: Ubuntu 14.04
Package: ubuntu-release-upgrader-core 1:0.220.7
ProcVersionSignature: Ubuntu 3.13.0-55.92-generic 3.13.11-ckt20
Uname: Linux 3.13.0-55-generic i686
ApportVersion: 2.14.1-0ubuntu3.11
Architecture: i386
CrashDB: ubuntu
CurrentDesktop: Unity
Date: Fri Jun 19 17:14:28 2015
InstallationDate: Installed on 2012-03-23 (1182 days ago)
InstallationMedia: Ubuntu 11.10 "Oneiric Ocelot" - Release i386 (20111012)
PackageArchitecture: all
SourcePackage: ubuntu-release-upgrader
UpgradeStatus: Upgraded to trusty on 2015-06-19 (0 days ago)
VarLogDistupgradeTermlog:

mtime.conffile..etc.update.manager.release.upgrades: 2015-06-18T11:09:04.277218