al2 command not found

Introduction

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

al2: command not found

or when using sudo you get the following error message

sudo: al2: command not found

Solutions to al2: command not found

How To Fix al2: command not found in Ubuntu / Debian / Kali Linux / Raspbian

In Ubuntu al2 is provided by mono-devel package.

mono-devel is:

Mono is a platform for running and developing applications based on the ECMA/ISO Standards. Mono is an open source effort led by Xamarin. Mono provides a complete CLR (Common Language Runtime) including compiler and runtime, which can produce and execute CIL (Common Intermediate Language) bytecode (aka assemblies), and a class library.

This package contains various development tools and pulls in the default development stack for Mono (which is 4.0 currently).

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

sudo apt-get -y install mono-devel

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

You can also use apt command to install mono-devel.

sudo apt -y install mono-devel

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

sudo aptitude install mono-devel

Summary

In this tutorial we learn how to fix al2 command not found error in Ubuntu / Debian / Kali Linux or Raspbian distribution.