I had an older version of libopencv_highgui.so installed in /opt/lib. This was a remnant from building Blender myself in the recent past. So "non-standard" means "other version than is in the Ubuntu repo".
I had an older version of libopencv_ highgui. so installed in /opt/lib.
This was a remnant from building Blender myself in the recent past.
So "non-standard" means "other version than is in the Ubuntu repo".