/usr/lib/pd/extra/pdlua/README.txt is in pd-lua 0.7.3-2.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/pd/extra/pdlua/../../../../share/doc/pd-lua/README
/usr/lib/pd/extra/pdlua/../../../../share/doc/pd-lua/README