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[Frieder Bluemle <frieder.bluemle@xxxxxxxxx>]

I had a similar issue and this thread helped me to resolve it.

For me it was a symlink in /etc/ld.so.conf.d/
i386-linux-gnu_GL.conf -> /etc/alternatives/i386-linux-gnu_gl_conf
The file contained some mesa directory reference which caused Steam to fail at startup.

Steps to fix:
sudo unlink i386-linux-gnu_GL.conf
sudo ldconfig

Thanks.

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Packages, which is subscribed to nvidia-prime in Ubuntu.
https://bugs.launchpad.net/bugs/1307466

Title:
  nvidia-prime problems with steam

Status in nvidia-prime package in Ubuntu:
  Invalid

Bug description:
  hello,
  if i launch steam on ubuntu 14.04 with nvidia-prime i get some errors:

  1) swrast is not exposed:

  $ LIBGL_DEBUG=verbose steam
  Running Steam on ubuntu 14.04 64-bit
  STEAM_RUNTIME is enabled automatically
  Installing breakpad exception handler for appid(steam)/version(1393366296_client)
  libGL: screen 0 does not appear to be DRI3 capable
  libGL: screen 0 does not appear to be DRI2 capable
  libGL: OpenDriver: trying /usr/lib/i386-linux-gnu/dri/tls/swrast_dri.so
  libGL: OpenDriver: trying /usr/lib/i386-linux-gnu/dri/swrast_dri.so
  libGL: driver does not expose __driDriverGetExtensions_swrast(): /usr/lib/i386-linux-gnu/dri/swrast_dri.so: undefined symbol: __driDriverGetExtensions_swrast
  libGL: Can't open configuration file /home/samu/.drirc: No such file or directory.
  libGL: Can't open configuration file /home/samu/.drirc: No such file or directory.
  libGL error: failed to load driver: swrast
  [...]

  2) steam complains with this error (but loads anyway)

  OpenGL GLX context is not using direct rendering, which may cause performance problems.
  For more information visit https://support.steampowered.com/kb_article.php?ref=9938-EYZB-7457.

  steam itself works, however i'm not able to play games but i'm not
  sure if this is due to previous errors or it is due to some missing 32
  arch libs since steam officially supports bumblebee and not nvidia-
  prime.

  Let me know if you need more information

  Regards
  Samuele

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