/usr/lib/x86_64-linux-gnu/libapol.so.4 is in libapol4 3.3.8+20151215-2.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/x86_64-linux-gnu/libapol.so.4.4
/usr/lib/x86_64-linux-gnu/libapol.so.4.4