/usr/share/doc/linux-tools-4.15.0-1020-aws/changelog.Debian.gz is in linux-tools-4.15.0-1020-aws 4.15.0-1020.20.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/doc/linux-tools-4.15.0-1020-aws/../linux-aws-tools-4.15.0-1020/changelog.Debian.gz