Nvidia installer / apt conflict solution
Note: this problem only occurs if you installed the nvidia driver with nvidia's installer. If you used the default Ubuntu method (jockey/apt), this problem should not exist.
Today, I logged in to Cinnamon to discover that I had no window manager or panel, but I could launch Nautilus from the desktop. My .xsession-errors told me that Clutter had crashed due to a fatal error, so I assumed that something happened to my graphics driver (I installed version 304.60 with the nvidia installer because jockey failed repeatedly).
I re-ran the nvidia installer which told me the installation had been altered (by apt, I imagine). The file in question was /usr/lib/libOpenCL.so, a symlink.
To fix this conflict, find out what is available:
Note: there was also a similar problem invoving /usr/lib/xorg/modules/extensions/libglx.so, but I have not seen it in recent versions of Ubuntu. I also made a script for it here.
I recommend that you fix this problem manually as I outlined above. If you choose to use my scripts, you do so at your own risk.
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