Fix Ubuntu Unity Grid/Tiling problems on T420

I had all sorts of problems on my Thinkpad T420 with Unity in Ubuntu 11.10, most notably that the grid/tiling feature did not work. I am using the on-board HD3000 graphics card with the i915 driver, but since my T420 has also a discrete graphics chip (which I had disabled in the BIOS) I also had the nvidia drivers installed.  However, this seemed to prevent the i915 drivers from loading correctly (e.g. glxgears did not run).  The work-around is to remove the nvdia-drivers and -settings packages:

sudo apt-get remove nvidia-settings nvidia-current

Reboot, and tiling should work again.

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