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I updated the kernel of my Ubuntu 20.04 to 5.4.0-37-generic and when I reboot the system I always got the device not found and the system doesn't boot.

Screenshot

karel
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Jay Pratap Singh
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  • That may be a microcode issue. See https://askubuntu.com/questions/1248769/intel-microcode-3-20200609-0ubuntu0-20-04-0-update-crashes-computer-unable-to-b – Pilot6 Jun 10 '20 at 15:23

1 Answers1

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Ok, I've done some tuning and here's my fix.

  1. Make sure that from grub you can access previous versions of your kernel (eg. 5.4.0-31)
  2. Install Grub Repair and run it with proposed fix (by accessing the system with a previous version of the kernel)
  3. Reboot
  4. Install Grub Customizer
  5. Copy "quiet splash acpi=off $vt_handoff" and paste in the corresponding line of the kernel 5.4.0-37 script and on the kernel script for the default startup option. Even thought it's the same kernel, grub treat these scripts as different, so a change in the latter won't affect the previous
  6. Save the new configuration
  7. Run apt update and apt upgrade. You should see a new package called "intel microcode". Proceed with installation
  8. Reboot
  9. Here, in my case, the battery indicator has been replaced by the I/O icon and the laptop wouldn't switch off anymore
  10. Go back to the Grub Customizer. Delete quiet splash acpi=off $vt_handoff from the script for both kernel 5.4.0-37 and the default option
  11. Reboot

And...should be solved!

Federico Ferrauto
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