GNU/Linux Zorin OS Installing Broadcom BCM4331 Driver Guide
Hi! The linked Tutorial shows you Step-by-Step How to Install Broadcom BCM4331 Wi-fi/Bluetooth Driver in Zorin OS 12.x/15.x 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 Zorin OS Broadcom BCM4331 Driver Installation Guide
Broadcom BCM4331 Driver Zorin OS Installation Guide