This should be fixed now. If not please run sudo aptitude install kubuntu-desktop. That should install it. Let me know if apt-get install kubuntu-desktop works before the other options so i know if the update did fix this. Thank you for reporting this bug.
-- Attempting to install kubuntu-desktop with apt-get fails with unmet dependencies https://launchpad.net/bugs/52952 -- kubuntu-bugs mailing list kubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/kubuntu-bugs
