Okay, my own problem is solved and may be unrelated to the others. Or not. :-)
Mine was, I had never fully installed KDE. Duh. So that explains why when I tried logging in to it I got a black screen. I'm now in it typing this after installing it via Synaptic Package Manager. -- Getting a black/blank screen when switching between users in lucid https://bugs.launchpad.net/bugs/574909 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
