Step-by-step – Ubuntu 16.04 Install Broadcom Wifi Driver Offline Easy Guide

Installing

3. 3. Downloading

   Download bcmwl-kernel-source for Ubuntu GNU/Linux

   bcmwl-kernel-source Installer

   Downloading bcmwl-kernel-source for Ubuntu

   Provides to Grab bcmwl-kernel-source, dkms, libc6-dev, and linux-libc-dev.
   Store them in a Separate Folder.

4. 4. Installing

   Then to Install bcmwl-kernel-source Driver
   Now Change to the Target with:

   cd ~/Downloads/[MYDIR]

   (But if you are in Trouble to Find the Location on Terminal then See: How to Access Downloads Folder from Browser.)
   And then simply play:

   sudo dpkg -i *.deb

5. 5. Loading

   Finally, to Load Broadcom Wifi Driver
   Execute:

   sudo modprobe -r b43 ssb wl brcmfmac brcmsmac bcma

   sudo modprobe wl