Install Mono on Linux

The Linux community has made Mono available for various distributions, check the download page for a list of packages.

Regardless of your distribution, you will need the Mono Project GPG signing key, which package managers require.

Debian, Ubuntu, and derivatives

Add the Mono Project GPG signing key in a root shell with:

apt-key adv --keyserver pgp.mit.edu --recv-keys 3FA7E0328081BFF6A14DA29AA6A19B38D3D831EF

Next, add the package repository in a root shell:

echo "deb http://download.mono-project.com/repo/debian wheezy main" > /etc/apt/sources.list.d/mono-xamarin.list

Update your package cache if necessary (i.e. run apt-get update), and run a package upgrade to upgrade existing packages to the latest available. Then install Mono as described in the usage section.

Note: While the APT package is built against Debian Wheezy, it is compatible with a number of Debian derivatives (including Ubuntu) which means you can use the same repository across all these distributions.

mod_mono (Ubuntu 13.10 and later, Debian 8.0 and later)

To enable mod_mono installation on Ubuntu 13.10 and later, and Debian 8.0 and later (and their derivatives), you will need to add a second repository to your system, in addition to the generic Debian/Ubuntu repository above:

echo "deb http://download.mono-project.com/repo/debian wheezy-apache24-compat main" >> /etc/apt/sources.list.d/mono-xamarin.list

Older Ubuntu releases

To enable installation on older Ubuntu releases such as Ubuntu 12.04 and Ubuntu 12.10 (and their derivatives), you will need to add a second repository to your system, in addition to the generic Debian/Ubuntu repository above:

echo "deb http://download.mono-project.com/repo/debian wheezy-libtiff-compat main" >> /etc/apt/sources.list.d/mono-xamarin.list

CentOS, Fedora, and derivatives

Add the Mono Project GPG signing key in a root shell with:

rpm --import "https://pgp.mit.edu/pks/lookup?op=get&search=0x3FA7E0328081BFF6A14DA29AA6A19B38D3D831EF"

Next, add the package repository in a root shell:

yum-config-manager --add-repo http://download.mono-project.com/repo/centos/

Update your package cache if necessary, and run a package upgrade to upgrade existing packages to the latest available.

Users of CentOS or RHEL (or similar distributions) may need to add the EPEL repository to their system to satisfy all dependencies

Usage

The package mono-devel should be installed to compile code.

The package mono-complete should be installed to install everything - this should cover most cases of “assembly not found” errors.

Accessing older releases

If for some reason you want to pin an older version of Mono rather than updating to the latest, you can modify the Debian repository to “wheezy/snapshots/X.XX.X” instead of “wheezy”. For example, “wheezy/snapshots/3.10.0” will lock you to that version.

These snapshots will cease receiving updates as soon as the next major Mono version gets uploaded - for example, as soon as Mono 3.12 gets uploaded, 3.10 will never receive updates.

On RPM distributions, force the package version in your package manager - all older versions are published in the YUM metadata and should be available.

Notes

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.

Note: Mono on Linux by default doesn’t trust any SSL certificates so you’ll get errors when accessing HTTPS resources. To import Mozilla’s list of trusted certificates and fix those errors, you need to run mozroots --import --sync.