/usr/share/doc/geogebra-gnome/changelog.Debian.gz is in geogebra-gnome 4.0.19.0+dfsg1-5.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/doc/geogebra-gnome/../geogebra/changelog.Debian.gz
/usr/share/doc/geogebra-gnome/../geogebra/changelog.Debian.gz