/usr/share/doc/libgstreamer1.0-0-dbg/README.gz is in libgstreamer1.0-0-dbg 1.2.4-0ubuntu1.1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/doc/libgstreamer1.0-0-dbg/../libgstreamer1.0-0/README.gz