Comment 4 for bug 1874985

Same problem on focal. It used to run with no problems before upgrading to focal from 19.10.
No problems running d2x-rebirth.
Output when running d1x-rebirth from repos with -debug -verbose:
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D1X-Rebirth v0.58.1 Feb 1 2020 15:24:25
This is a MODIFIED version of Descent, based on Registered v1.5 Jan 5, 1996.
Copyright (C) 1994, 1995 Parallax Software Corporation
DESCENT is a trademark of Interplay Productions, Inc.
Copyright (C) 2005-2011 Christian Beckhaeuser

Getting settings from DESCENT.CFG...
PHYSFS: Adding archives to the game.
Using SDL_mixer library
sdl-joystick: found 0 joysticks
Going into graphics mode...
OpenGL: vendor: Intel Open Source Technology Center
OpenGL: renderer: Mesa DRI Intel(R) HD Graphics 4000 (IVB GT2)
OpenGL: version: 3.0 Mesa 20.0.8
ogl_maxanisotropy:16.000000
Initializing palette system...
Initializing font system...
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