unstable is not part of Ubuntu, rather part of Debian. It sounds like you've misconfigured your /etc/apt/sources.list file. You'll need to sort that out to be able to complete the upgrade of Ubuntu.
** 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/1432366 Title: dist upgrade to kubuntu 14.10 failed to load all packages To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/ubuntu-release-upgrader/+bug/1432366/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs