🤑 Indie game store🙌 Free games😂 Fun games😨 Horror games
👷 Game development🎨 Assets📚 Comics
🎉 Sales🎁 Bundles

Steam requests support for Ubuntu 12.04 although a lot of developers tend to aim for Ubuntu 14.04 these days since 12.04 is a little old and there are some big differences between the two (though mostly for 64-bit but that's what most people use on Linux these days).