rubydns-check command not found

Introduction

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

rubydns-check: command not found

or when using sudo you get the following error message

sudo: rubydns-check: command not found

Solutions to rubydns-check: command not found

How To Fix rubydns-check: command not found in Ubuntu / Debian / Kali Linux / Raspbian

In Ubuntu rubydns-check is provided by ruby-rubydns package.

ruby-rubydns is:

RubyDNS is a high-performance DNS server which can be easily integrated into other projects or used as a stand-alone daemon. By default it uses rule-based pattern matching. Results can be hard-coded, computed, fetched from a remote DNS server or fetched from a local cache, depending on requirements.

In addition, RubyDNS includes a high-performance asynchronous DNS resolver built on top of Celluloid. This module can be used by itself in client applications without using the full RubyDNS server stack.

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

sudo apt-get -y install ruby-rubydns

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

You can also use apt command to install ruby-rubydns.

sudo apt -y install ruby-rubydns

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

sudo aptitude install ruby-rubydns

Summary

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