ykclient command not found

In this troubleshooting guide we learn how to fix ykclient command not found error message

Introduction

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

ykclient: command not found

or when using sudo you get the following error message

sudo: ykclient: command not found

In Ubuntu ykclient is provided by libykclient-dev package.

libykclient-dev is:

YubiKeys are USB tokens that act like keyboards and generate one-time passwords (OTPs). The tokens are produced and sold by Yubico.

This library is used for talking to an online validation server such as yubikey-server-c, yubikey-server-php or yubikey-server-j.

This package contains the necessary files for developers, and a command line tool “ykclient” to perform OTP queries from the shell.

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

sudo apt-get -y install libykclient-dev

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

You can also use apt command to install libykclient-dev.

sudo apt -y install libykclient-dev

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

sudo aptitude install libykclient-dev

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