It looks like the python-qt4/python-qt4-core from http://kubuntu.org/packages/kde4-3.90.1 confuses the upgrade.
Could you please check if removing those and install the feisty packages fixes the issue? Thanks, Michael ** This bug is no longer a duplicate of bug 156102 [kde] RuntimeError: underlying C/C++ object has been deleted (was: Upgrade tool crashed Kubuntu Feisty to Gutsy) ** Summary changed: - unable to upgrade from 7.04 to 7.10 + [kde] http://kubuntu.org/packages/kde4-3.90.1 confuses upgrade (was: unable to upgrade from 7.04 to 7.10) -- [kde] http://kubuntu.org/packages/kde4-3.90.1 confuses upgrade (was: unable to upgrade from 7.04 to 7.10) https://bugs.launchpad.net/bugs/155674 You received this bug notification because you are a member of Ubuntu Bugs, which is the bug contact for Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs