Oh, maybe the problem is simpler than that... Your kernel log is telling
you that you have the wrong driver version installed. It's asking you to
use version 340 instead:

[ 2047.082719] NVRM: The NVIDIA GeForce 8400 GS GPU installed in this system is
               NVRM:  supported through the NVIDIA 340.xx Legacy drivers. Please
               NVRM:  visit http://www.nvidia.com/object/unix.html for more
               NVRM:  information.  The 390.138 NVIDIA driver will ignore
               NVRM:  this GPU.  Continuing probe...

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https://bugs.launchpad.net/bugs/1887829

Title:
  graphic card not working

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