So, in summary:
1) -> it seems there is an issue in unity for not starting in Colin's case, 
even if unity_support_test tells he's using llvmpipe, needs to be checked 
upstream

2) we shouldn't export LIBGL_ALWAYS_SOFTWARE=1 to the environment using a 
checker. Because that means that all software that can't maybe use unity under 
hw acceleration but can use smaller apps with hw acceleration will be defaulted 
to llvmpipe. If we set that to the environment with the checker, all 
applications will  be impacted.
So unity itself should do the check at initiliziation time, force and 
reinitialize with this env variable and then unset it.

3 and 4) can't really be dealt with unfortunately

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https://bugs.launchpad.net/bugs/1039155

Title:
  Unity fails to load on old hardware. Missing automatic fallback to
  LLVMpipe

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