$ sudo apt-get update
$ sudo apt-get install rdtool-elisp 

rdtool-elisp is installed in your system.

Make ensure the rdtool-elisp package were installed using the commands given below,

$ sudo dpkg-query -l | grep rdtool-elisp *

You will get with rdtool-elisp package name, version, architecture and description in a table

rdtool-elisp package basic information: