How To Get Wi-Fi Working on a Dell XPS 13 9343 (Broadcom BCM4352) Running Ubuntu 20.10 (Groovy Gorilla)

The Dell XPS 13 9343 is the second-generation Sputnik Developer Edition laptop that came pre-loaded with Ubuntu 14.04 LTS (Trusty Tahr). As a former Canonical employee, I was one of the first lucky folks to put that machine into production. And now, over five years on, it’s still one of my favorite ultra-portable…