$ sudo apt-get update
$ sudo apt-get install netcat-openbsd 

netcat-openbsd is installed in your system.

Make ensure the netcat-openbsd package were installed using the commands given below,

$ sudo dpkg-query -l | grep netcat-openbsd *

You will get with netcat-openbsd package name, version, architecture and description in a table

netcat-openbsd package basic information: