12.10 black desktop (graphics issue?)

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http://askubuntu.com – I've just upgraded from 12.04 to 12.10. The upgrade went smoothly I think, but when I log in now everything is black, I can only see my mouse cursor. At first I could see my old wallpaper, but no launcher or menu bar or icons and after reboot it's now only black. I've seen similar questions and forum topics, but anything I've tried has not helped. Through Ctrl+Alt+F1 I have uninstalled nVidia drivers (I have a GeForce 6200) and reinstalled them, I have tried to reinstall lightdm, I've tried to install Linux headers, but nothing is working. It seems similar to a problem I had when I first (HowTos)