/usr/share/doc/desktopnova-module-xfce/changelog.Debian.gz is in desktopnova-module-xfce 0.8.1-1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/doc/desktopnova-module-xfce/../desktopnova/changelog.Debian.gz