/usr/share/doc/linux-cloud-tools-4.15.0-45-generic/changelog.Debian.gz is in linux-cloud-tools-4.15.0-45-generic 4.15.0-45.48~16.04.1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/doc/linux-cloud-tools-4.15.0-45-generic/../linux-hwe-cloud-tools-4.15.0-45/changelog.Debian.gz