Comment 31 for bug 1768610

I'm adding a mesa task, as this bug also needs to be fixed for people who *already* removed the package without purging it. I suggest mesa, because that's the package that LIBGL_ALWAYS_SOFTWARE=1 acts on (mostly?) - so fixing it there will fix for everybody whereas ubuntu-desktop or whatever might miss some people. But it's a matter for Marco and the mesa maintainers really.