[ubuntu-studio-users] Network disabled on PC after last update

Mike Squires michael.leslie.squires at gmail.com
Mon Apr 19 18:54:45 UTC 2021

I have a system running 20.04 on a Dell T7600 with motherboard audio and 
a Presonus 24C USB interface; haven't seen that problem although I've 
been updating regularly.  I'll watch out for it, however.


Mike Squires

On 4/19/21 2:32 PM, Ross Gammon wrote:
> Hi Paul,
> On 18/04/2021 18:20, sciguy wrote:
>> I have a desktop computer that dual boots into Ubuntu Studio and Windows
>> 10. It is connected to the internet using a cat-5 cable to my router.
>> After the last update and rebooting, it turns out that I no longer have
>> ethernet on Linux. This is not true on Windows, as I am writing you this
>> email from the same computer.
>> I strongly suspect that there is an update issue that is disabling
>> ethernet on Linux. Right now, my computer is in splendid isolation from
>> the rest of the world. I can't even see computer resources from other
>> computers in my apartment. I also can't see the router itself through my
>> browser.
>> Any ideas as to what to do next to diagnose the problem?
>> Paul
> If you updated Ubuntu a while back and haven't used it for a while, you
> may have been hit by a bug caused by some of the kernel security
> releases causing network connectivity to fail if you have a USB audio
> device.
> This happened to me a couple of times after an update.
> The solution was to reboot and select an old version of the kernel in
> the GRUB menu. If you are lucky, that version of the kernel will have a
> working network and you can do an update of the system. The latest
> kernels do not have the problem.
> This is a bit of a guess, because you gave more information about your
> Windows version than your Ubuntu Studio version. :-)
> Regards,
> Ross
Michael L. Squires, Ph.D., M.P.A.
546 North Park Ridge Road
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Known in the SCA as Alan Culross, KSCA, OP, etc.
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Home phone: 812-333-6564
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UN*X at home since 1985

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