New to Lutris and having issues with NES Libretro

Trying to auto install some Nes games for testing, using Kubuntu X64, Super Mario 3 says libretro installer, I cannot install the runner or the script as it says libretro is not x64 supported? Is this correct or is there something else I need to do? I am coming from Launchbox and hoping this can help remove my windows gaming a bit more.