Comment 5 for bug 1039155

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Daniel van Vugt (vanvugt) wrote : Re: Unity fails to load: compiz (unityshell) - Error: OpenGL 1.4+ not supported

Yes, it looks like in quantal, we should have modified:
   /etc/X11/Xsession.d/50_check_unity_support
to export LIBGL_ALWAYS_SOFTWARE=1 if the support test fails, thus enabling LLVMpipe.

It seems what we've done instead is just delete the file. So hardware that doesn't support UnityShell won't automatically fall back to LLVMpipe like it should.