I'm currently running an older version of KiCad on my Linux machine, which runs 12.04. It's a long-term support version of Ubuntu, but not the very latest one (that's 14.04 LTS). I have read about the PPA for installing KiCad on Ubuntu, but as far as I can see, that only supports 14.04 and newer versions. I'd like to upgrade to the latest version 4 KiCad.
Is there any way to get a pre-compiled package for Kicad 4 on Ubuntu 12.04? Or do I need to compile from source code? And if I try the latter, will it work? has anyone done this?