Testing with Ubuntu 20

Download latest daily build of Ubuntu 20 - http://cdimage.ubuntu.com/daily-live/current/focal-desktop-amd64.iso
Install it on a VM or wherever (I recommend 15 GB)
Side note- I was stuck in a login-loop until I chose "Wayland" using the little button that shows up after you click your login name
Open Ubuntu's "Software & Updates" screen > Developer Options tab > Check the box "Pre-released Updates"
You'll be asked to reload your software cache when you click Close
sudo apt-get install gnuradio
Make sure it installed 3.8.1

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