/usr/lib/libgpac.so.3 is in libgpac3 0.5.0+svn5324~dfsg1-1+b3.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/libgpac.so.3.1.0
/usr/lib/libgpac.so.3.1.0