/usr/share/doc/libxfce4panel-2.0-dev/changelog.Debian.gz is in libxfce4panel-2.0-dev 4.12.2-1ubuntu1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/doc/libxfce4panel-2.0-dev/../libxfce4panel-2.0-4/changelog.Debian.gz