GNU/Linux Ubuntu 18.04 Install Broadcom WiFi Driver Offline
The tutorial shows you step-by-step How to Download and Install Broadcom Wireless Driver without Internet Access in Ubuntu 18.04 Bionic LTS 64-bit GNU/Linux desktops.
Most noteworthy: to achieve this Setup you simply need any Online Computer with a Browser and a USB Stick to Copy the downloaded Packages.
But if you dispose of an Android Mobile Phone with Internet Acces, then an Easier Solution should be of using it! See: Internet Connection USB Tethering Guide.
Finally, the Fedora 18.04 kmod-wl Driver Supports the following Broadcom Wireless Chipsets:
- BCM4311
- BCM4312
- BCM4313
- BCM4321
- BCM4322
- BCM43142
- BCM43224
- BCM43225
- BCM43227
- BCM43228
- BCM4331
- BCM4352
- BCM4360
Finally, for BCM4306, BCM4309, and BCM4318 after the Required Packages setup see instead: B43 Wireless Driver.

Broadcom B43 Wireless Driver Ubuntu 18.04 Offline Installation