I would like to install Debian 8.9 (Jessie) on a HP EliteBook 840 G4 laptop. lspci (when executed from a shell launched from inside Debian Installer) informs me that it possesses the following Ethernet device:

Ethernet Controller: Intel Corporation Device 9d21 (rev 21)

The laptop is plugged into Ethernet, and a WLAN network would be available as well.

Early on during Debian installation (at step "Detect network hardware") I run into the following problem: The installer informs me that no Ethernet card was detected and that a driver is needed for my Ethernet card. It then presents me with a long list of choices, but among them is no obvious match to Intel Corporation Device 9d21 (rev 21).

I've tried the installation process by booting both from the debian-8.9.0-amd64-netinst.iso and firmware-8.9.0-amd64-netinst.iso netinst images, but ran into the same problem each time.

So what is needed in order to install Debian 8.9 on that particular laptop?


Switching to Debian 9.2 (Stretch), which was possible in my situation, allowed me to overcome the problem.

After starting the installation by booting from firmware-9.2.1-amd64-netinst.iso (on a 1st USB stick) I received the following message:

Some of your hardware needs non-free firmware files to operate. The firmware can be loaded from removable media, such
as a USB stick or floppy.

The missing firmware files are iwlwifi-8265-26.ucode, iwlwifi-8265-26.ucode iwlwifi-8265-24.ucode

If you have such media available now, insert it, and continue.

After then inserting firmware-iwlwifi_20161130-3_all.deb (on a 2nd USB stick), the installation was able to recognize both the Ethernet and WLAN network interfaces:

enp0s31f6: Intel Corporation Ethernet Connection (4) I219-V
wlp2sn: Intel Corporation Device 24fd (wireless)

Starting the installation by booting from debian-9.2.1-amd64-netinst.iso resulted in the same message, but here the installer apparently was not able to load the missing firmware files form the 2nd US stick.

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