/usr/lib/x86_64-linux-gnu/libgiblib.so is in giblib-dev 1.2.4-10.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/x86_64-linux-gnu/libgiblib.so.1.0.6
/usr/lib/x86_64-linux-gnu/libgiblib.so.1.0.6