/usr/share/doc/linux-cloud-tools-lowlatency-hwe-16.04/changelog.gz is in linux-cloud-tools-lowlatency-hwe-16.04 4.15.0.20.23.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/doc/linux-cloud-tools-lowlatency-hwe-16.04/../linux-cloud-tools-lowlatency/changelog.gz