/usr/lib/x86_64-linux-gnu/libxfce4panel-2.0.so is in libxfce4panel-2.0-dev 4.12.0-3ubuntu2.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/x86_64-linux-gnu/libxfce4panel-2.0.so.4.0.0
/usr/lib/x86_64-linux-gnu/libxfce4panel-2.0.so.4.0.0