u2f-server command not found

Introduction

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

u2f-server: command not found

or when using sudo you get the following error message

sudo: u2f-server: command not found

Solutions to u2f-server: command not found

How To Fix u2f-server: command not found in Ubuntu / Debian / Kali Linux / Raspbian

In Ubuntu u2f-server is provided by u2f-server package.

u2f-server is:

Libu2f-server is a package for doing Universal 2nd Factor (U2F) server communication and has functionality for the Registration and Authentication operations. The package contains a C library, a command line tool, and documentation.

This is a command line tool to do registration and authentication with a U2F device.

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

sudo apt-get -y install u2f-server

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

You can also use apt command to install u2f-server.

sudo apt -y install u2f-server

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

sudo aptitude install u2f-server

Summary

In this tutorial we learn how to fix u2f-server command not found error in Ubuntu / Debian / Kali Linux or Raspbian distribution.