/usr/share/doc/libgraphite2-3-dbg/changelog.Debian.gz is in libgraphite2-3-dbg 1.3.10-0ubuntu0.14.04.1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/doc/libgraphite2-3-dbg/../libgraphite2-3/changelog.Debian.gz