/usr/lib/lua/5.2/gv.so is in libgv-lua 2.36.0-0ubuntu3.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/lua/5.2/../../graphviz/lua/liblua5.2-libgv.so
/usr/lib/lua/5.2/../../graphviz/lua/liblua5.2-libgv.so