/usr/share/doc/knetwalk/changelog.Debian.gz is in knetwalk 4:4.8.2-0ubuntu1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/doc/knetwalk/../libkdegames5a/changelog.Debian.gz
/usr/share/doc/knetwalk/../libkdegames5a/changelog.Debian.gz