GUIs including 3D view not opening on Ubuntu in Python 3.13

[ssilburn]

On Kubuntu 24.04: under python 3.13, any of the calcam GUIs which use VTK do not open. Depending on the VTK version (tested with 9.4 to 9.6), it either fails silently or produces the error:

2026-03-02 20:19:13.369 ( 0.776s) [ 79D261C5C740]vtkEGLRenderWindowInter:251 WARN| Setting an EGL display to device index: -1 require EGL_EXT_device_base EGL_EXT_platform_device EGL_EXT_platform_base extensions
2026-03-02 20:19:13.369 ( 0.776s) [ 79D261C5C740]vtkEGLRenderWindowInter:257 WARN| Attempting to use the default egl display for the current platform...
2026-03-02 20:19:13.369 ( 0.776s) [ 79D261C5C740]vtkEGLRenderWindowInter:263 WARN| Could not initialize a device. Exiting...
2026-03-02 20:19:13.369 ( 0.776s) [ 79D261C5C740]vtkEGLRenderWindowInter:307 WARN| Could not set device as display. EGL_EXT_device_base, EGL_EXT_platform_device and EGL_EXT_platform_base extensions are required.

However, everything works fine in Python 3.12.

[ssilburn]

Now also tested in Python 3.14 and it also works fine, so this is specific to Python 3.13. For now I'm just going to add to the documentation a recommendation against using Python 3.13 specifically.