Seems to be only related to nvidia-experimental, however there's a lot of 
little fixing required to get back to where you should be:
1) Remove nvidia-experimental-
2) Reboot and login ( should put you at a Desktop w/o Unity )
3) Launch CCSM - I needed to create a desktop shortcut to do so... i.e.:
[Desktop Entry]
Name=CCSM
Exec=ccsm
Type=Application
4) Re-enable Unity / Desktop Wall
5) Hit the default keybinding on just about anything you used before and toggle 
the reveal for the launcher ( if you use it ) from off to on.

That seemed to get me back to working state.

If you do want NVidia proprietary still, go ahead and just install
304/310/313 ( whichever supports your GPU ) - and avoid experimental.
:)

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https://bugs.launchpad.net/bugs/1166253

Title:
  Regression: Unity does not launch on startup

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