shield-purge command not found

In this troubleshooting guide we learn how to fix shield-purge command not found error message

Introduction

When you run more command in linux terminal / console, you get the following error message

shield-purge: command not found

or when using sudo you get the following error message

sudo: shield-purge: command not found

In Ubuntu shield-purge is provided by libpam-shield package.

libpam-shield is:

In certain situations it is not possible to use host based authentication and here pam-shield comes in use.

It locks out brute-force password crackers using null-route or iptables rules.

To fix this problem, we can install more using the command below.

sudo apt-get -y install libpam-shield

This command might take some time to finish depending on your machine internet connection.

You can also use apt command to install libpam-shield.

sudo apt -y install libpam-shield

Or if you have aptitude installed you can use the following command.

sudo aptitude install libpam-shield

In this tutorial we learn how to fix shield-purge command not found error in Ubuntu / Debian / Kali Linux or Raspbian distribution.