/usr/share/doc/linux-cloud-tools-4.15.0-30-generic/changelog.Debian.gz is in linux-cloud-tools-4.15.0-30-generic 4.15.0-30.32.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/doc/linux-cloud-tools-4.15.0-30-generic/../linux-cloud-tools-4.15.0-30/changelog.Debian.gz