Cannot get rid of nvidia drivers, restore nouveau driver and get desktop working

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http://askubuntu.com – I made the mistake of installing the Nvidia Linux drivers direct from their website. It failed because it could not remove the nouveau driver. Next I manually installed the nvidia drivers from the repository which successfully installed the nvidia driver, but the Ubuntu desktop does not function; no launcher, no menu bar, no windows. (Gnome seems to work though). So I want to revert back to the vanilla installed nouveau driver. I tried sudo stop lightdm sudo apt-get purge nvidia* sudo apt-get install xserver-xorg-video-nouveau sudo rm /etc/X11/xorg.conf sudo reboot but lshw -c video revea (HowTos)