$ sudo apt-get update
$ sudo apt-get install libjenkins-htmlunit-java 

libjenkins-htmlunit-java is installed in your system.

Make ensure the libjenkins-htmlunit-java package were installed using the commands given below,

$ sudo dpkg-query -l | grep libjenkins-htmlunit-java *

You will get with libjenkins-htmlunit-java package name, version, architecture and description in a table

libjenkins-htmlunit-java package basic information: