/usr/share/doc/libarpack2-dev/README is in libarpack2-dev 3.0.2-3.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/doc/libarpack2-dev/../libparpack2-dev/README
/usr/share/doc/libarpack2-dev/../libparpack2-dev/README