/usr/share/doc/linux-cloud-tools-3.13.0-125-generic/changelog.Debian.gz is in linux-cloud-tools-3.13.0-125-generic 3.13.0-125.174.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/doc/linux-cloud-tools-3.13.0-125-generic/../linux-cloud-tools-3.13.0-125/changelog.Debian.gz