ppm2theora command not found

In this troubleshooting guide we learn how to fix ppm2theora command not found error message

Introduction

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

ppm2theora: command not found

or when using sudo you get the following error message

sudo: ppm2theora: command not found

In Ubuntu ppm2theora is provided by gerris package.

gerris is:

Gerris is a system for the solution of the partial differential equations describing fluid flow.

A brief summary of its main (current) features:

Solves the time-dependent incompressible variable-density Euler, Stokes or Navier-Stokes equations
Adaptive mesh refinement: the resolution is adapted dynamically to the features of the flow
Entirely automatic mesh generation in complex geometries
Second-order in space and time
Unlimited number of advected/diffused passive tracers
Flexible specification of additional source terms
Portable parallel support using the MPI library
Volume of Fluid advection scheme for interfacial flows

This package has MPI support built in.

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

sudo apt-get -y install gerris

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

You can also use apt command to install gerris.

sudo apt -y install gerris

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

sudo aptitude install gerris

In this tutorial we learn how to fix ppm2theora command not found error in Ubuntu / Debian / Kali Linux or Raspbian distribution.