/usr/share/doc/linux-tools-4.15.0-1023-kvm/changelog.Debian.gz is in linux-tools-4.15.0-1023-kvm 4.15.0-1023.23.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/doc/linux-tools-4.15.0-1023-kvm/../linux-kvm-tools-4.15.0-1023/changelog.Debian.gz