/usr/share/doc/libknewstuff3-4/changelog.Debian.gz is in libknewstuff3-4 4:4.8.5-0ubuntu0.6.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/doc/libknewstuff3-4/../libkdecore5/changelog.Debian.gz