Some graphics libraries such as Julia's GR.jl and Python's VTK require X11 (Linux's windowing system) support files. You're might encounter the following error when running your code: libXt.so.6: cannot open shared object file: No such file or directory .

The solution is straightforward. Add the following apt-get  dependencies to your capsule (using the package management system):

  • libgl1-mesa-glx 
  • libxt6 

For VTK, these additional dependencies might be required:

  • libglu1-mesa 
  • libsm6 
  • libxrender1 
  • libfontconfig1 

For more information on GR.jl, see this GitHub issue.

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