This file is indexed.

/usr/lib/x86_64-linux-gnu/libGLU.so.1 is in libglu1-mesa 8.0.2-0ubuntu3.

This file is owned by root:root, with mode 0o777.

It is a symlink to /usr/lib/x86_64-linux-gnu/libGLU.so.1.3.08000