Somewhere in /etc/apt/sources.list or /etc/apt/sources.list.d/ you have a reference to karmic-backports, and as karmic is no longer supported the files listed in the description can not be found. You'll need to find and remove these references.
-- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1095233 Title: Trying to update to Kubuntu 12.10 and get error message To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/ubuntu-release-upgrader/+bug/1095233/+subscriptions -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
