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Debian 9 "Stretch"

  1. Add a "non-free" component to /etc/apt/sources.list, for example:

    # Debian 9 "Stretch"
            deb http://httpredir.debian.org/debian/ stretch main contrib non-free
  2. Update the list of available packages and install the firmware-iwlwifi package:

    # apt-get update && apt-get install firmware-iwlwifi
  3. As the iwlwifi module is automatically loaded for supported devices, reinsert this module to access installed firmware:

    # modprobe -r iwlwifi ; modprobe iwlwifi
  4. Configure your wireless interface as appropriate.

Wiki: https://wiki.debian.org/iwlwifi