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I have a problem and I hope someone can help me. I installed Debian 11 with a UEIFI installation. During the installation I had to provide the firmware for a Realtek network card. After I booted into the system everything worked fine. I rebooted and the system got stucked. I searched for this problem and found that I had to edit the file

/etc/defaults

And add nomodeset to the boot options.

Then, apt-upgrade grub.

The problem comes here. Now the reboot doesn't get stuck but I have no internet. This computer uses Ethernet connection. I checked that everything was ok on the /etc/network/interfaces file. If I revert changes I still have no internet and can't boot into the system.

I suspect that somehow the grub update removed the Realtek firmware. I also found that /sbin stoped being on path for root after the update.

Does someone know how to fix this? I can't use most of the solutions I found online because I don't have access to internet.

Thanks.

Carlos Andrés del Valle
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  • Maybe this can help? https://unix.stackexchange.com/questions/50098/linux-network-troubleshooting-and-debugging – user1280483 Sep 07 '22 at 04:15
  • /sbin not being on path for root when using su happened back in Debian 10 as it transitioned from old su from the ancient shadow package to the newer su implementation of util-linux. – telcoM Sep 07 '22 at 06:21

1 Answers1

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apt-upgrade does not seem to exist, neither does /etc/defaults; the appropriate command after updating /etc/default/grub would have been update-grub.

If the Debian 11 installer has an internet connection, it will automatically download the most recent updates as part of the installation process. Your up-to-date kernel might -in the absolute worst case- require a different version of the firmware file than the old kernel used by the installer. Please see what dmesg | grep -i firmware says, and if it reports any missing files, check if it is the same firmware file requested by the installer, and make sure it is in the expected location under /lib/firmware.

You might have to use another OS or computer to download the firmware file from e.g. from the linux-firmware Git repository (find the file you need, then click "plain" on the right-most column to download it), then use an USB stick or similar to move the firmware file in place to the appropriate directory under /lib/firmware.

telcoM
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