This is because you've installed the cinnamon package from a PPA which provides a greater version number of the package than the official Ubuntu package. Subsequently, the release upgrader is unable to calculate the upgrade. You'll need to install the version of cinnamon from the official Ubuntu archive to be able to complete the upgrade.
** Changed in: ubuntu-release-upgrader (Ubuntu) Status: New => Invalid -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1245882 Title: Upgrading Ubuntu 13.04 to Ubuntu 13.10 impossible To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/ubuntu-release-upgrader/+bug/1245882/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs