The issue there is a that nux-tools has a conffile that does
"    /usr/lib/nux/unity_support_test || export LIBGL_ALWAYS_SOFTWARE=1"

When the package is removed but not purged the command fails and
software rendering is enabled wrongly

Marco could you have a look, we should probably fix the script to not
export the env if the helper is missing

** Package changed: gnome-session (Ubuntu) => nux (Ubuntu)

** Changed in: nux (Ubuntu)
   Importance: Undecided => High

** Changed in: nux (Ubuntu)
     Assignee: (unassigned) => Marco Trevisan (TreviƱo) (3v1n0)

** Summary changed:

- No acceleration after upgrading to 18.04: gnome-session-check-accelerated 
incorrectly picks llvmpipe
+ leftover conffile forces GNOME is software rendering

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https://bugs.launchpad.net/bugs/1768610

Title:
  leftover conffile forces GNOME is software rendering

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