hydra_nameserver command not found

Introduction

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

hydra_nameserver: command not found

or when using sudo you get the following error message

sudo: hydra_nameserver: command not found

Solutions to hydra_nameserver: command not found

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

In Ubuntu hydra_nameserver is provided by mpich package.

mpich is:

MPICH is a high-performance and widely portable implementation of the MPI-3.1 standard from the Argonne National Laboratory. It efficiently supports different computation and communication platforms including commodity clusters, SMPs, massively parallel systems, and high-speed networks. This release has all MPI 3.1 functions and features required by the standard with the exception of support for the “external32” portable I/O format and user-defined data representations for I/O.

This package includes the program binaries necessary to run MPICH programs.

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

sudo apt-get -y install mpich

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

You can also use apt command to install mpich.

sudo apt -y install mpich

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

sudo aptitude install mpich

Summary

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