/usr/share/doc/gstreamer0.10-plugins-good-dbg/README.gz is in gstreamer0.10-plugins-good-dbg 0.10.31-3+nmu4ubuntu2~gcc5.1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/doc/gstreamer0.10-plugins-good-dbg/../gstreamer0.10-plugins-good/README.gz