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 reveals I still have one nvidia driver and one i915 driver. nouveau has not returned and the desktop will not function.
I am considering a complete reinstall, is there anything else to try?
I have followed the other threads with the same issues, but the solutions did not work
sudo dpkg-reconfigure xserver-xorg
creates an error
sudo apt-get install --reinstall xserver-xorg.core libgl1-mesa-glx
did not make a difference