I recently upgraded my laptop to Ubuntu 16.04 and save one issue, it has been rock solid. The problem? Wi-Fi, of course. Prior to the install, I ran Ubuntu in a live session and poked around. I even installed the proprietary Broadcom drivers, and they worked straight away. During the installation process, I checked the box directing that proprietary drivers, codecs, etc. be installed. However, upon boot I discovered that the Wi-Fi drivers had not been installed! The following instructions provide a quick offline fix for this issue using either the GUI or the terminal.