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I am trying to test an application using Xvfb or Xnest to prevent constant popups to disrupt my work. Unfortunately, both Xnest and Xvfb make my client crash with a segfault. Xvfb does not provide any feedback for what's going on, but Xnest specifically complains about the lack of NV-GLX extensions. Everything works well and with the nvidia drivers on my desktop.

I use ubuntu 12.04

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