/usr/lib/x86_64-linux-gnu/libxfce4kbd-private-3.so is in libxfce4ui-2-dev 4.12.1-2.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/x86_64-linux-gnu/libxfce4kbd-private-3.so.0.0.0
/usr/lib/x86_64-linux-gnu/libxfce4kbd-private-3.so.0.0.0