$ sudo apt-get update
$ sudo apt-get install rdnssd-udeb 

rdnssd-udeb is installed in your system.

Make ensure the rdnssd-udeb package were installed using the commands given below,

$ sudo dpkg-query -l | grep rdnssd-udeb *

You will get with rdnssd-udeb package name, version, architecture and description in a table

rdnssd-udeb package basic information: