/usr/share/doc/gnash-cygnal/changelog.Debian.gz is in gnash-cygnal 0.8.10-5ubuntu1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/doc/gnash-cygnal/../gnash-common/changelog.Debian.gz
/usr/share/doc/gnash-cygnal/../gnash-common/changelog.Debian.gz