issue resolved. I had prevented one package (ia32-libs) not to be updated for my printer. Once i updated that, the installation went ahead.
Thanks Sudheep -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1312015 Title: Upgrading from 12.04 LTS to 14.04 LTS To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/update-manager/+bug/1312015/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs