/usr/lib/x86_64-linux-gnu/libgldi.so is in libgldi-dev 3.3.99.beta1.2.really.3.3.2-0ubuntu2.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/x86_64-linux-gnu/libgldi.so.3
/usr/lib/x86_64-linux-gnu/libgldi.so.3