/usr/share/doc/linux-tools-3.16.0-43-generic/changelog.Debian.gz is in linux-tools-3.16.0-43-generic 3.16.0-43.58~14.04.1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/doc/linux-tools-3.16.0-43-generic/../linux-lts-utopic-tools-3.16.0-43/changelog.Debian.gz