Your system information

• Steam client version (build number or date):
  Issue was not present weekend of Nov 28/29, Steam client update Dec 7th (1607372145)
• Distribution (e.g. Ubuntu):
  XUbuntu 18.04 / Intel CPU / Nvidia GTX 1080
• Opted into Steam client beta?: [Yes/No]
  No
• Have you checked for system updates?: [Yes/No]
  Yes Only after I ran into the issue. Only other change was to upgrade Discord client (discord-0.0.13.deb)

Also verified files.

Please describe your issue in as much detail as possible:

Screen goes blank then Game fails to launch. Seems to be triggering my screen lock.

Several people have started reporting this issue in the Game's Steam Discussion topics. Some examples:
General
Bug Reports

Last lines from Game's "output.txt"
`/home/USER/.steam/steam/steamapps/common/Shadowrun Dragonfall Director's Cut/Dragonfall_Data/Plugins/x86/libsteamwrap.so : Could not load a dll file. Make sure that the steam_api.dll/libsteam_api.dylib file is placed at the correct location. See the documentation for more info.

(Filename: /BuildAgent/work/d3d49558e4d408f4/artifacts/LinuxStandalonePlayerGenerated/UnityEngineDebug.cpp Line: 53)

Attempting to find steamwrap.so

(Filename: /BuildAgent/work/d3d49558e4d408f4/artifacts/LinuxStandalonePlayerGenerated/UnityEngineDebug.cpp Line: 53)
`

Steps for reproducing this issue:

1. Attempt to Launch the Game from Steam Client or Game's Command line Shell Scripts.