/usr/share/doc/libknewstuff2-4/changelog.Debian.gz is in libknewstuff2-4 4:4.13.3-0ubuntu0.5.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/doc/libknewstuff2-4/../libkdecore5/changelog.Debian.gz