/usr/lib/libcoyotl-3.1.so.4 is in libcoyotl-3.1-4 3.1.0-6ubuntu1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/libcoyotl-3.1.so.4.0.0
/usr/lib/libcoyotl-3.1.so.4.0.0