I found an Ubuntu educational fork for Scratch 3 beta version. You just need to change language from french to english =)
For scratch 1.4 just type:
sudo apt-get install scratch
I'm not in informatics, but I think in the 1.4 version a library like Qt4 is missing for the fonts.
For Scratch 2, I didn't manage to install Adobe Air 20, it bugs too much on Wine install :/
Please don't over spam this french academy, as I don't believe at all their Bandwith to handle World's download neither a town's download. Just add the download to a normal download website for Ubuntu packages.
More over there must be an official link outside of the one I proposed as it's official Scratch 3 official beta version online works with Linux. Must be somewhere in GitHub or something?