/usr/share/doc/linux-tools-4.18.0-1005-gcp/changelog.Debian.gz is in linux-tools-4.18.0-1005-gcp 4.18.0-1005.6~18.04.1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/doc/linux-tools-4.18.0-1005-gcp/../linux-gcp-edge-tools-4.18.0-1005/changelog.Debian.gz