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Release channels: Nightly - Preview - Stable
The latest Preview Mono release is: 6.12.0 Preview (6.12.0.206)
Source code is available on GitHub (viewing only) or as a Tarball.
Please choose your operating system to view the available packagesMono for macOS is available as a Mac Package (.pkg)
Please refer to the installation guide for more information about how to install and configure your Mono environment.
Supported on macOS 10.9 and later. Check the uninstall instructions if you want to remove Mono from your Mac.
1 Add the Mono repository to your system
The package repository hosts the packages you need, add it with the following commands.
Note: the packages should work on newer Ubuntu versions too but we only test the ones listed below.
Ubuntu 20.04 (amd64, armhf, arm64, ppc64el)
sudo apt install ca-certificates gnupg
sudo gpg --homedir /tmp --no-default-keyring --keyring /usr/share/keyrings/mono-official-archive-keyring.gpg --keyserver hkp://keyserver.ubuntu.com:80 --recv-keys 3FA7E0328081BFF6A14DA29AA6A19B38D3D831EF
echo "deb [signed-by=/usr/share/keyrings/mono-official-archive-keyring.gpg] https://download.mono-project.com/repo/ubuntu preview-focal main" | sudo tee /etc/apt/sources.list.d/mono-official-preview.list
sudo apt update
Ubuntu 18.04 (i386, amd64, armhf, arm64, ppc64el)
sudo apt install ca-certificates gnupg
sudo gpg --homedir /tmp --no-default-keyring --keyring /usr/share/keyrings/mono-official-archive-keyring.gpg --keyserver hkp://keyserver.ubuntu.com:80 --recv-keys 3FA7E0328081BFF6A14DA29AA6A19B38D3D831EF
echo "deb [signed-by=/usr/share/keyrings/mono-official-archive-keyring.gpg] https://download.mono-project.com/repo/ubuntu preview-bionic main" | sudo tee /etc/apt/sources.list.d/mono-official-preview.list
sudo apt update
Ubuntu 16.04 (i386, amd64, armhf, arm64, ppc64el)
sudo apt-key adv --keyserver hkp://keyserver.ubuntu.com:80 --recv-keys 3FA7E0328081BFF6A14DA29AA6A19B38D3D831EF
sudo apt install apt-transport-https ca-certificates
echo "deb https://download.mono-project.com/repo/ubuntu preview-xenial main" | sudo tee /etc/apt/sources.list.d/mono-official-preview.list
sudo apt update
2 Install Mono
sudo apt install mono-devel
The package mono-devel should be installed to compile code.
The package mono-llvm-support should be installed for LLVM JIT/AOT support. See here for more about LLVM Mono.
The package mono-complete should be installed to install everything - this should cover most cases of "assembly not found" errors.
The package mono-dbg should be installed to get debugging symbols for framework libraries - allowing you to get line numbers in stack traces.
The package referenceassemblies-pcl should be installed for PCL compilation support - this will resolve most cases of "Framework not installed: .NETPortable" errors during software compilation.
The package ca-certificates-mono should be installed to get SSL certificates for HTTPS connections. Install this package if you run into trouble making HTTPS connections.
The package mono-xsp4 should be installed for running ASP.NET applications.
3 Verify Installation
After the installation completed successfully, it's a good idea to run through the basic hello world examples on this page to verify Mono is working correctly.
Notes
Mono on Linux before 3.12 by default didn't trust any SSL certificates so you got errors when accessing HTTPS resources. This is not required anymore as 3.12 and later include a new tool that runs on package installation and syncs Mono's certificate store with the system certificate store (on older versions you had to import Mozilla's list of trusted certificates by running mozroots --import --sync
). Some systems are configured in a way so that the necessary package isn't pulled in when Mono is installed, in those cases make sure the ca-certificates-mono
package is installed.
1 Add the Mono repository to your system
The package repository hosts the packages you need, add it with the following commands.
Note: the packages should work on newer Debian versions too but we only test the ones listed below.
Debian 10 (i386, amd64, armhf, arm64, armel, ppc64el)
sudo apt install dirmngr ca-certificates gnupg
sudo gpg --homedir /tmp --no-default-keyring --keyring /usr/share/keyrings/mono-official-archive-keyring.gpg --keyserver hkp://keyserver.ubuntu.com:80 --recv-keys 3FA7E0328081BFF6A14DA29AA6A19B38D3D831EF
echo "deb [signed-by=/usr/share/keyrings/mono-official-archive-keyring.gpg] https://download.mono-project.com/repo/debian preview-buster main" | sudo tee /etc/apt/sources.list.d/mono-official-preview.list
sudo apt update
2 Install Mono
sudo apt install mono-devel
The package mono-devel should be installed to compile code.
The package mono-llvm-support should be installed for LLVM JIT/AOT support. See here for more about LLVM Mono.
The package mono-complete should be installed to install everything - this should cover most cases of "assembly not found" errors.
The package mono-dbg should be installed to get debugging symbols for framework libraries - allowing you to get line numbers in stack traces.
The package referenceassemblies-pcl should be installed for PCL compilation support - this will resolve most cases of "Framework not installed: .NETPortable" errors during software compilation.
The package ca-certificates-mono should be installed to get SSL certificates for HTTPS connections. Install this package if you run into trouble making HTTPS connections.
The package mono-xsp4 should be installed for running ASP.NET applications.
3 Verify Installation
After the installation completed successfully, it's a good idea to run through the basic hello world examples on this page to verify Mono is working correctly.
Notes
Mono on Linux before 3.12 by default didn't trust any SSL certificates so you got errors when accessing HTTPS resources. This is not required anymore as 3.12 and later include a new tool that runs on package installation and syncs Mono's certificate store with the system certificate store (on older versions you had to import Mozilla's list of trusted certificates by running mozroots --import --sync
). Some systems are configured in a way so that the necessary package isn't pulled in when Mono is installed, in those cases make sure the ca-certificates-mono
package is installed.
1 Add the Mono repository to your system
The package repository hosts the packages you need, add it with the following commands.
Note: the packages should work on newer Raspbian versions too but we only test the ones listed below.
Raspbian 10 (armhf)
sudo apt install dirmngr ca-certificates gnupg
sudo gpg --homedir /tmp --no-default-keyring --keyring /usr/share/keyrings/mono-official-archive-keyring.gpg --keyserver hkp://keyserver.ubuntu.com:80 --recv-keys 3FA7E0328081BFF6A14DA29AA6A19B38D3D831EF
echo "deb [signed-by=/usr/share/keyrings/mono-official-archive-keyring.gpg] https://download.mono-project.com/repo/debian preview-raspbianbuster main" | sudo tee /etc/apt/sources.list.d/mono-official-preview.list
sudo apt update
2 Install Mono
sudo apt install mono-devel
The package mono-devel should be installed to compile code.
The package mono-llvm-support should be installed for LLVM JIT/AOT support. See here for more about LLVM Mono.
The package mono-complete should be installed to install everything - this should cover most cases of "assembly not found" errors.
The package mono-dbg should be installed to get debugging symbols for framework libraries - allowing you to get line numbers in stack traces.
The package referenceassemblies-pcl should be installed for PCL compilation support - this will resolve most cases of "Framework not installed: .NETPortable" errors during software compilation.
The package ca-certificates-mono should be installed to get SSL certificates for HTTPS connections. Install this package if you run into trouble making HTTPS connections.
The package mono-xsp4 should be installed for running ASP.NET applications.
3 Verify Installation
After the installation completed successfully, it's a good idea to run through the basic hello world examples on this page to verify Mono is working correctly.
Notes
Mono on Linux before 3.12 by default didn't trust any SSL certificates so you got errors when accessing HTTPS resources. This is not required anymore as 3.12 and later include a new tool that runs on package installation and syncs Mono's certificate store with the system certificate store (on older versions you had to import Mozilla's list of trusted certificates by running mozroots --import --sync
). Some systems are configured in a way so that the necessary package isn't pulled in when Mono is installed, in those cases make sure the ca-certificates-mono
package is installed.
Mono for Windows is available as a Windows Installer file
Please refer to the installation guide for more information about how to install and configure your Mono environment.
Supported on Windows 7, 8, 10 or later.
GTK# for .NET
Installer for running Gtk#-based applications on Microsoft .NET:
Release Notes
Check out the release notes of all Mono versions on the releases page.
MonoDevelop IDE
Please visit the MonoDevelop website for more details about our cross-platform IDE.
Older releases
To access older Mono releases for macOS and Windows, check the archive on the download server. For Linux, please check the "Accessing older releases" section in the installation guide.