Testing with Ubuntu 20

Instructions for installing the latest Ubuntu 20 daily build, as well as the latest version of GNU Radio in Debian Unstable (3.8.1.0-rc1 at the time of writing this) to test under Ubuntu 20

1. Download latest daily build of Ubuntu 20 - http://cdimage.ubuntu.com/daily-live/current/focal-desktop-amd64.iso
2. Install it on a VM or wherever
3. sudo apt install git cmake g++ libboost-all-dev libgmp-dev swig python3-numpy python3-mako python3-sphinx python3-lxml doxygen libfftw3-dev libsdl1.2-dev libgsl-dev libqwt-qt5-dev libqt5opengl5-dev python3-pyqt5 liblog4cpp5-dev libzmq3-dev python3-yaml python3-click python3-click-plugins python3-zmq python3-scipy
4. Open Ubuntu's "Software & Updates" screen > Developer Options tab > Check the box "Pre-released Updates"
5. sudo apt-get update
6. sudo apt-get install gnuradio
7. Make sure it installed 3.8.1