/usr/lib/x86_64-linux-gnu/liblua5.1-sec.so is in lua-sec-dev 0.5.1-1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/x86_64-linux-gnu/liblua5.1-sec.so.1.0.0
/usr/lib/x86_64-linux-gnu/liblua5.1-sec.so.1.0.0