Upgrade to version 14.04 from 12.04 failed

[Sankhya Singh]

I have been trying to upgrade to version 14.04.05 LTS from my current version 12.04. While "Setting new software channels" it fails giving me the error that upgrade cannot be calculated.

I have been trying to update for a while but it always fails at the same step.
Please help

Thanks and Regards,
Sankhya

ProblemType: Bug
DistroRelease: Ubuntu 12.04
Package: update-manager 1:0.156.14.21
ProcVersionSignature: Ubuntu 3.8.0-44.66~precise1-generic 3.8.13.25
Uname: Linux 3.8.0-44-generic x86_64
ApportVersion: 2.0.1-0ubuntu17.15
Architecture: amd64
Date: Tue Jun 6 11:37:25 2017
GsettingsChanges:
 com.ubuntu.update-manager check-new-release-ignore 'trusty'
 com.ubuntu.update-manager first-run false
 com.ubuntu.update-manager launch-time 1496728390
 com.ubuntu.update-manager window-height 500
 com.ubuntu.update-manager window-width 595
InstallationMedia: Custom 12.04 - Release amd64
MarkForUpload: True
PackageArchitecture: all
ProcEnviron:
 LANGUAGE=en_IN:en
 TERM=xterm
 PATH=(custom, no user)
 LANG=en_IN
 SHELL=/bin/bash
SourcePackage: update-manager
Symptom: ubuntu-release-upgrader-core
UpgradeStatus: Upgraded to precise on 2017-06-06 (0 days ago)
VarLogDistupgradeTermlog:

[Sankhya Singh (sankhya-singh)]

dist-upgrade

[Ubuntu Foundations Team Bug Bot (crichton)]

You seem to have installed the cinnamon package on Ubuntu 13.10. Unfortunately, that package is not available yet for 14.04. To upgrade to Ubuntu 14.04 LTS you'll need to either wait for a fix for cinnamon to be available or uninstall the package and then upgrade.

[This is an automated message. I apologize if it reached you inappropriately; please just reply to this message indicating so.]