firmware-iwlwifi software package provides Binary firmware for Intel Wireless cards, you can install in your Debian 9 (Stretch) by running the commands given below on the terminal,
$ sudo apt-get update $ sudo apt-get install firmware-iwlwifi
firmware-iwlwifi is installed in your system.
Make ensure the firmware-iwlwifi package were installed using the commands given below,
$ sudo dpkg-query -l | grep firmware-iwlwifi *
You will get with firmware-iwlwifi package name, version, architecture and description in a table
| Distro | Debian 9 stretch |
| Section | Kernels |
| Package | firmware-iwlwifi |
| Version | 20160824-1 |
| Description | Binary firmware for Intel Wireless cards |
| Sub Section | Kernels |
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