/usr/lib/x86_64-linux-gnu/libad9361.so is in libad9361-dev 0.1-2.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/x86_64-linux-gnu/libad9361.so.0
/usr/lib/x86_64-linux-gnu/libad9361.so.0