telnet-ssl command not found

Introduction

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

telnet-ssl: command not found

or when using sudo you get the following error message

sudo: telnet-ssl: command not found

Solutions to telnet-ssl: command not found

How To Fix telnet-ssl: command not found in Ubuntu / Debian / Kali Linux / Raspbian

In Ubuntu telnet-ssl is provided by telnet-ssl package.

telnet-ssl is:

The telnet command is used for interactive communication with another host using the TELNET protocol.

SSL telnet replaces normal telnet using SSL authentication and encryption. It interoperates with normal telnetd in both directions. It checks if the other side is also talking SSL, if not it falls back to normal telnet protocol.

Advantages over normal telnet: Your passwords and the data you send will not go in cleartext over the line. Nobody can get it with tcpdump or similar tools. With SSLtelnet you can also connect to https-server like https://www.mozilla.org. Just do ’telnet -z ssl www.mozilla.org 443'

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

sudo apt-get -y install telnet-ssl

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

You can also use apt command to install telnet-ssl.

sudo apt -y install telnet-ssl

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

sudo aptitude install telnet-ssl

Summary

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