$ sudo apt-get update
$ sudo apt-get install kea-dhcp-ddns-server 

kea-dhcp-ddns-server is installed in your system.

Make ensure the kea-dhcp-ddns-server package were installed using the commands given below,

$ sudo dpkg-query -l | grep kea-dhcp-ddns-server *

You will get with kea-dhcp-ddns-server package name, version, architecture and description in a table

kea-dhcp-ddns-server package basic information: