How To Install Mono On Ubuntu 20.04

“Mono” is a free and open-source Microsoft .NET framework for developing and running cross-platform applications in C# and other languages.  It allows developers to make the multi-platform applications faster by using databases such as Mysql, Postgresql, and others. Now, it is accessible n Ubuntu as well, which broadens the project capabilities. Moreover, the majority of developers use it for small applications where speed or solution of a particular problem are the most important factors.

In this write-up, we will install the “Mono” development platform by using the official repository.


The only prerequisite for installing “Mono” is that you must log in to the root user or as a user with sudo privileges.

Installation Process

Mono is not pre-installed in the Ubuntu repository; the Mono official repository is the most convenient and straightforward way to install it. To do so, simply follow the steps below:

Updating Packages

To install the new application in the system, it is highly recommended to update and upgrade your existing system packages.

To update your APT, use:

$ sudo apt update

Installing Key Packages:

Now run the below-mentioned command to get essential packages for “Mono”:

$ sudo apt install dirmngr gnupg apt-transport-https ca-certificates

To begin the installation, hit “y”.

Extracting GPC Key

If the repository is added, you will be able to install all future updated versions of “Mono” without difficulty. Now, paste the given command into your terminal to extract the GPC key:

$ sudo apt-key adv --keyserver hkp://keyserver.ubuntu.com:80 --recv-keys 3FA7E0328081BFF6A14DA29AA6A19B38D3D831EF

Adding “Mono” Repository

Add the “Mono” repository file to your system source list, then copy and paste the mentioned command into the terminal:

$ Sudo apt-add-repository 'deb <a href="https://download.mono-project.com/repo/ubuntu">https://download.mono-project.com/repo/ubuntu</a> stable-bionic main'

Installing “Mono”

You must first update the list of your installed packages before adding the new one:

$ sudo apt update

The term “mono-complete” refers to the entire mono package, including all of its features and resources. Use the given command to install it:

$ sudo apt install mono-complete

The “MonoDevelop” IDE makes it simple to create a .NET project. Type the command below to install it:

$ sudo apt install monodevelop

Type “Monodevelop” in the application search menu to ensure that “Monodevelop” has been installed.

To run the “NUnit” test, type the command shown below to install the Nunit plugin for Monodevelop:

$ sudo apt install monodevelop-nunit

Verify the installation:

If the installation is complete, run the command shown below to verify the “Mono” application:

$ mono --version

It displays the installed version of the “Mono” application, as well as additional information.

Creating Program in Mono

To make sure “Mono” is installed and working correctly, we’ll create a program.

Open the text editor and write the following code:

using System;

public class Linuxhint


     public static void Main(string args[])


        Console.WriteLine ("Welcome to the Linuxhint");



Name the file “testcode.cs” and save it.

Use “csc” compiler to compile the file:

$ csc testcode.cs

To make it executable, use:

$ mono testcode.exe

The following files will be found in your home directory.


Mono” is an open-source platform that is used to develop and run multiplatform, all of this is accomplished using C# and other mono-supported programming languages. In this write-up, we have gone through the installation process for the “Mono” project in great detail. We have also created Program to test the C# compiler. “Mono” allows a developer to quickly create applications on any platform including Linux. It also assists in porting applications to another platform as well.

About the author

Aqsa Maqbool

As a Software engineer, I am passionate to write about various IT related
articles but have deep interest in Linux. I spend most of my time reading Linux related blogs and IT related books. I want to serve the world with my writing skills.