We are happy to say that Linux version RetroArch available on Itch.io! The version here will have the same features as the standalone version. You can download the Cores you want to use with Online Updater. If you are using RetroArch for the first time, the links below will help you. 

You can join our Discord channel and chat with us and a lot people! You can also watch our series of tutorial videos on this link. Finally, you can see the latest developments from our Twitter and detailed information from our documentation site.