/usr/share/doc/linux-cloud-tools-4.4.0-121-lowlatency/changelog.Debian.gz is in linux-cloud-tools-4.4.0-121-lowlatency 4.4.0-121.145.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/doc/linux-cloud-tools-4.4.0-121-lowlatency/../linux-cloud-tools-4.4.0-121/changelog.Debian.gz