Thanks for your report. xorg from xorg-edgers PPA is holding back an essential package. Please revert to the packages from the official ubuntu repository before upgrading. ppa-purge may help you to do this.
I'm closing this report because it's not a bug with Ubuntu. ** Changed in: update-manager (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/773622 Title: Upgrade Kubuntu to version 11.04 stopped an unresolvable problem when calculating the upgrade -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs