/usr/lib/x86_64-linux-gnu/mesa-egl/libGLESv1_CM.so.1 is in libgles1-mesa 10.1.0-4ubuntu5.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/x86_64-linux-gnu/mesa-egl/libGLESv1_CM.so.1.1.0
/usr/lib/x86_64-linux-gnu/mesa-egl/libGLESv1_CM.so.1.1.0