/usr/share/doc/ffgtk/changelog.Debian.gz is in ffgtk 1.8.14-2build3.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/doc/ffgtk/../libroutermanager0/changelog.Debian.gz
/usr/share/doc/ffgtk/../libroutermanager0/changelog.Debian.gz