GNU/Linux Mint 18 Installing Broadcom BCM4352 Driver Guide
How to Install Broadcom BCM4352 Wi-fi/Bluetooth Driver on 18.x Sarah/Serena/Sonya/Sylvia LTS GNU/Linux – 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 Mint Broadcom BCM4352 Driver Installation Guide