How To Install System Information Tool HardInfo 0.6 Alpha (GTK3) On Ubuntu, Pop!_OS Or Linux Mint From PPA

HardInfo is a graphical system information (hardware, system info, software) and benchmark tool. Since there have not been any new HardInfo releases since 2009 (but the tool is still under development), I have created a PPA to easily install HardInfo 0.6 alpha (from Git) built with GTK3 on Ubuntu, Pop!_OS and Linux Mint.