Testing with Ubuntu 20

Instructions for installing 3.8.1.0-rc1 and the latest Ubuntu 20 daily build:

 * 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