/usr/share/doc/libmecab-dev/AUTHORS is in libmecab-dev 0.996-1.2ubuntu1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/doc/libmecab-dev/../libmecab2/AUTHORS
/usr/share/doc/libmecab-dev/../libmecab2/AUTHORS