/usr/share/doc/xfce4-power-manager-plugins/changelog.Debian.gz is in xfce4-power-manager-plugins 1.4.4-4ubuntu2.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/doc/xfce4-power-manager-plugins/../xfce4-power-manager/changelog.Debian.gz