/usr/share/doc/libg3d-plugin-gdkpixbuf/changelog.Debian.gz is in libg3d-plugin-gdkpixbuf 0.0.8-17ubuntu1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/doc/libg3d-plugin-gdkpixbuf/../libg3d0/changelog.Debian.gz