/usr/share/doc/libgdchart-gd2-xpm-dev/README is in libgdchart-gd2-xpm-dev 0.11.5-7.1ubuntu1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/doc/libgdchart-gd2-xpm-dev/../libgdchart-gd2-xpm/README