/usr/share/doc/linux-cloud-tools-4.15.0-36-lowlatency/changelog.Debian.gz is in linux-cloud-tools-4.15.0-36-lowlatency 4.15.0-36.39.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/doc/linux-cloud-tools-4.15.0-36-lowlatency/../linux-cloud-tools-4.15.0-36/changelog.Debian.gz