GNU/Linux Pop!_OS Installing Broadcom BCM43142 Driver Guide
The linked tutorial shows you step-by-step How to Install Broadcom BCM43142 Wi-fi/Bluetooth Driver on Pop!_OS LTS GNU/Linux desktop – Step by step Tutorial.
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 Pop!_OS Broadcom BCM43142 Driver Installation Guide