/usr/lib/x86_64-linux-gnu/libkea-dhcp++.so.4 is in kea-common 1.1.0-1build2.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/x86_64-linux-gnu/libkea-dhcp++.so.4.0.1
/usr/lib/x86_64-linux-gnu/libkea-dhcp++.so.4.0.1