Download the latest SA-MP server from the SA-MP download page and extract it to your desired location.
You need to install mono 4.6 or newer. To check which version of mono you have installed, type
mono --version in your console.
mono-complete package. You can find Mono's instructions on installing Mono on linux here.
Download the latest plugin(
sampsharp-*.zip) from the download page and extract it's contents to your server directory.