$ sudo apt-get update
$ sudo apt-get install libkntlm4 

libkntlm4 is installed in your system.

Make ensure the libkntlm4 package were installed using the commands given below,

$ sudo dpkg-query -l | grep libkntlm4 *

You will get with libkntlm4 package name, version, architecture and description in a table

libkntlm4 package basic information: