/usr/share/doc/navit-gui-gtk/changelog.Debian.gz is in navit-gui-gtk 0.5.0~svn4776+dfsg.1-3build1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/doc/navit-gui-gtk/../navit-graphics-gtk-drawing-area/changelog.Debian.gz