Just tried the latest version of this installed on the SP github distro. Worked fine on a pristine Ubuntu 19.04 vm running on my Mac. Only minor problem is that I had to set the execute bit with chmod +x before running. On the pristine machine I also had to sudo pat install git to download the distro, but otherwise it was all in the script. I suppose I could have got a zip version instead 
I also added qjackctl to make it easy to setup jackd as I wanted it.
It’s very similar to the build process I am using on Raspbian Buster on my Pi4.
Thanks for posting it.