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nvidia-390 does not find libnvidia-egl-wayland.so



This problem also happens with the latest non-PPA Nvidia drivers, but I assume 
this is where the developers hang out. The problem is that the Nvidia EGL 
driver need a JSON file to find extension libraries, and it looks in 


but the Ubuntu packages put the files in 


Copying the JSON files over to /usr/share/egl/egl_external_platform.d/
makes everything work again.

The context is that Qt-based compositors (and Weston with the EGLStreams 
patches) suddenly stopped working on Nvidia hardware after an update.


- Paul