Step-by-step – Ubuntu 18.04 Install Broadcom Wifi Driver Offline

Installing

2. 2. Looking Up Card Model

   Then to Find Wireless Card Model
   For the PCI/PCIe internal Adapters simply run the Command:

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   lspci -v | grep Wireless

   But for the USB Dongles try instead with:

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   lsusb -v | grep Wireless

   The grep Command refine the result following the matching Keyword.
   And in the Output you’ll easily See the Card’s Manufacturer and Model:

   

   Possibly, take note of your Wireless Device Model.

3. 3. Downloading Broadcom Wl Driver

   Download Broadcom Wl for Ubuntu GNU/Linux

   Here Broadcom bcmwl-kernel-source with Dependencies

   Link to Download Broadcom Wl Driver with Dependecies for Ubuntu GNU/Linux

   This Archive is home Packaged to includes All the needed Dependencies to make your Life Easier! ;)

4. 4. Trasferring Packages

   First, copy the downloaded Stuff on a removable USB Drive
   Next, Copy Broadcom Wl into Ubuntu 18.04 System
   First, access the USB Key:

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   cd [/path/2/usb]/

   But if you are in Trouble to Find it out on Terminal then See: How to Access USB Device.
   And Copy the Archives into the Downloads Folder:

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   cp bcmwl-kernel-source*.tar.gz ~/Downloads/

5. 5. Installing Broadcom Wl Driver

   Then to Install Required Stuff
   First, access the Target:

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   cd ~/Downloads

   Then to Extract the Stuff:

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   tar xzvf ./bcmwl-kernel-source*.tar.gz

   Next access the Target Folder:

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   cd ./bcmwl-kernel-source*/bcmwl*/

   To Setup run:

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   sudo apt install ./bcmwl-kernel-source*.deb

   Authenticate with the User Admin Pass.
   If Got “User is Not in Sudoers file” then see: How to Enable sudo.

6. 6. Loading Broadcom Wl Driver

   Finally, to Load Broadcom Wifi Driver
   Execute:

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   sudo modprobe -r b43 ssb wl brcmfmac brcmsmac bcma

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   sudo modprobe wl

And Happy Internet with Broadcom Wl Driver on Ubuntu 18.04! :)