ykman command not found

Introduction

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

ykman: command not found

or when using sudo you get the following error message

sudo: ykman: command not found

Solutions to ykman: command not found

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

In Ubuntu ykman is provided by yubikey-manager package.

yubikey-manager is:

YubiKey Manager (ykman) is a command line tool for configuring a YubiKey over all transports. It is capable of reading out device information as well as configuring several aspects of a YubiKey, including enabling or disabling connection transports and programming various types of credentials.

YubiKey is a specific series of personal Hardware Security Modules, meant to protect private keys tied to its users (for 2nd factor authentication, use with OpenPGP, …).

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

sudo apt-get -y install yubikey-manager

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

You can also use apt command to install yubikey-manager.

sudo apt -y install yubikey-manager

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

sudo aptitude install yubikey-manager

Summary

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