I tried again after reading Leon's comment about kubuntu-desktop but kubuntu-desktop was still on my machine so instead I ran:
sudo dpkg-reconfigure kubuntu-desktop ...and all was well but this is a nasty bug that surely should have been caught. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/708151 Title: can't log in to KDE after upgrading to 4.6 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs