vfychain command not found

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

Introduction

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

vfychain: command not found

or when using sudo you get the following error message

sudo: vfychain: command not found

In Ubuntu vfychain is provided by libnss3-tools package.

libnss3-tools is:

This is a set of tools on top of the Network Security Service libraries. This package includes:

certutil: manages certificate and key databases (cert7.db and key3.db)
modutil: manages the database of PKCS11 modules (secmod.db)
pk12util: imports/exports keys and certificates between the cert/key databases and files in PKCS12 format.
shlibsign: creates .chk files for use in FIPS mode.
signtool: creates digitally-signed jar archives containing files and/or code.
ssltap: proxy requests for an SSL server and display the contents of the messages exchanged between the client and server.

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

sudo apt-get -y install libnss3-tools

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

You can also use apt command to install libnss3-tools.

sudo apt -y install libnss3-tools

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

sudo aptitude install libnss3-tools

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