/usr/share/doc/gnome-mplayer-dbg/changelog.Debian.gz is in gnome-mplayer-dbg 1.0.9-3ubuntu1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/doc/gnome-mplayer-dbg/../gnome-mplayer/changelog.Debian.gz