GNU/Linux Ubuntu 20.04 Installing Broadcom BCM4321/BCM4322 Driver Guide
Hi! The linked Tutorial shows you Step-by-Step How to Install Broadcom BCM4321/BCM4322 Wi-fi/Bluetooth Driver for Ubuntu 20.04 Focal LTS GNU/Linux.
The Package Provides the Source Code for the wl Kernel Modules and makes use of the DKMS Build Utility to Install them for the Running Kernel.
GNU/Linux Ubuntu Broadcom BCM4321/BCM4322 Driver Installation Guide