in.telnetd command not found

Introduction

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

in.telnetd: command not found

or when using sudo you get the following error message

sudo: in.telnetd: command not found

Solutions to in.telnetd: command not found

How To Fix in.telnetd: command not found in Ubuntu / Debian / Kali Linux / Raspbian

In Ubuntu in.telnetd is provided by telnetd package.

telnetd is:

The in.telnetd program is a server which supports the DARPA telnet interactive communication protocol.

This legacy server should in general be abandoned in favour of a contemporary ssh-server, as this implementation only is able to process password and user name in clear text. Other variants, like telnetd-ssl and a selection of Kerberized TELNET servers, are able to improve on this by providing secure forms of authentication and encryption.

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

sudo apt-get -y install telnetd

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

You can also use apt command to install telnetd.

sudo apt -y install telnetd

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

sudo aptitude install telnetd

Summary

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