This same thing happen to me trying to update from Ubuntu Karmic 9.10 to Lucid Release Candidate.
I tried disabling some repositories but the error would persist and would not allow me to upgrade to 10.04 RC. The way I solved it is by uninsatalling openoffice.org-core, upgrading, and then reinstalling after the upgrade was finished. -- Failed to upgrade from 9.10 to lucid alpha2 https://bugs.launchpad.net/bugs/526055 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs