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this post was submitted on 06 Aug 2023
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Linux
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Linux is a family of open source Unix-like operating systems based on the Linux kernel, an operating system kernel first released on September 17, 1991 by Linus Torvalds. Linux is typically packaged in a Linux distribution (or distro for short).
Distributions include the Linux kernel and supporting system software and libraries, many of which are provided by the GNU Project. Many Linux distributions use the word "Linux" in their name, but the Free Software Foundation uses the name GNU/Linux to emphasize the importance of GNU software, causing some controversy.
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Run dmesg and see if you find anything suspicious of the cause. If you find something like "blah blah... Ethernet... Blah blah... Key was rejected by service" or similar, it's due to secureboot.
If this is actually related to secureboot your drivers are most likely not in tree and installed via dkms, so they need to be signed or secureboot won't allow them. You can setup a machine-owner-key to sign them yourself, and you can setup dkms to automatically sign them using that key. The instructions are on dkms' readme. After setting up you need to run
dkms autoinstallor manually reinstall the drivers to trigger the automatic signing.Edit: I just noticed you said you deactivated secure boot... I have no clue. But for future reference, you can sign your modules to work with secure boot, it's not a bad idea.