Step-by-step – Intel WiFi Drivers Installation in Debian Buster

Installing

2. 2. Looking Up Card Model

   Then to Find Wireless Card Model
   Simply run the Command:

   lspci -v | grep Wireless

   But for the USB Dongles try instead with:

   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:

   

   This to make Sure the Adapter is Supported by this Firmware!
   Possibly Check the Driver specification page to Find out All Supported Models.
   But if you Do Not identify a Supported Model in the Output then instead See: How to Install firmware-ipw2x00 and firmware-intelwimax.

3. 3. Setting Up Backports

   How to Install Backports Repository on Debian GNU/Linux

   Backports Debian Buster Setup Guide

   GNU/Linux Debian Buster Backports Installation Guide

   Follow instructions to Enable the ‘contrib‘ and ‘non-free‘ Sources.

4. 4. Installing Firmware

   Then to Install Intel Wireless Firmware Package
   Simply play:

   sudo apt install firmware-iwlwifi

   If Got “User is Not in Sudoers file” then see: How to Enable sudo

5. 5. Loading Firmware

   Now to Load Intel Wireless Adapter
   Just perform:

   sudo modprobe -r iwlwifi  && sudo modprobe iwlwifi