/usr/share/doc/libdbusmenu-gtk4/changelog.Debian.gz is in libdbusmenu-gtk4 12.10.3+14.04.20140319-0ubuntu1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/doc/libdbusmenu-gtk4/../libdbusmenu-glib4/changelog.Debian.gz