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I have a fresh install of Debian "bullseye" stable but I am unable to connect to the internet wirelessly. As you can see in my settings under "Network", "wireless" is not even an option.

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During the installation process, I got some missing firmware issues during the "detect network hardware"enter image description here

I do not know why I do not have the necessary firmware. Nonetheless, I continued with the installation and then during the "configure the network" stage, I got the following screen:

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The output of uname -a on my system is Linux debian 5.10.0-22-amd64 #1 SMP Debian 5.10.178-3 (2023-04-22) x86_64 GNU/Linux

Some more backstory / relevant information: I was first experiencing this issue of no network detection when I had Fedora installed on the computer. The wireless connection used to work on that machine until one day, I opened up and poof no option to connect to wireless. I decided that I would distro hop to debian in hopes that the wireless network issue would be resolved. But clearly I am having the same issue with debian. Interestingly, however, is I first tried to install the i386 version of debian and in that installation, my wireless network did work. So I assume it is not a problem with the network hardware itself.

Can anyone help me diagnose what the issue is? Do I need to manually install the missing firmware that the debian installation was complaining about?

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  • Yes, that would be the first step: manually install the firmware. Commented May 4, 2023 at 20:34
  • @EduardoTrápani apologies for my ignorance but where can I find all of those firmware files that I need? Commented May 4, 2023 at 20:45
  • I found this resource github.com/wkennington/linux-firmware ..is this what I am looking for? Commented May 4, 2023 at 21:00
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    You need to find out first which wireless card you have. Then you can search and download the software. Commented May 4, 2023 at 22:25

2 Answers 2

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So just as the debian installer mentioned, my computer was missing some firmware for my network hardware for one reason or another. So all I had to do was install the firmware.

What I did:

  1. Figure out what network controller my computer has by running lspci

For me I had the following:

Network controller: Intel Corporation Wireless-AC 9260 (rev 29)

  1. Find the firmware on the internet and download it.

For my intel network controller, I was able to find it here. https://www.intel.com/content/www/us/en/support/articles/000005511/wireless.html

  1. Transfer the .tgz to your machine and install it

First need to unzip it: tar -xvzf /path/to/yourfile.tgz The folder I unzipped had a README file on how to then install the firmware. For me I had to run cp iwlwifi-9260-th-b0-jf-b0-34.ucode /lib/firmware

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here is similar question that had already been asked Installing missing firmware in debian

Try installing missing firmware from non-free debian repositories.

  1. edit /etc/apt/sources.list and add contrib non-free at the end of each repository URL

deb http://deb.debian.org/debian bullseye main contrib non-free

deb http://deb.debian.org/debian-security/ bullseye-security main contrib non-free

deb http://deb.debian.org/debian bullseye-updates main contrib non-free

  1. sudo apt update && sudo apt install firmware-iwlwifi
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