/usr/lib/x86_64-linux-gnu/libaoflagger.so is in aoflagger-dev 2.10.0-2.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/x86_64-linux-gnu/libaoflagger.so.0
/usr/lib/x86_64-linux-gnu/libaoflagger.so.0