I am facing lots of issues on kernel 5.4 so I decided to update to kernel 5.8.10.

I am getting the following error message: error message

I am using Ubuntu 18.04.5 with lenovo bios 1.10 , secure boot disabled.


You’ll likely need to update the GRUB_CMDLINE_LINUX_DEFAULT in your /etc/default/grub file to include iommu=pt. If you cannot boot normally, you may need a Live USB to make this work.

  1. Edit the Grub boot file as root:
    sudo vi /etc/default/grub
  2. Add the iommu flag to GRUB_CMDLINE_LINUX_DEFAULT so that you have something like:
    GRUB_CMDLINE_LINUX_DEFAULT="quiet splash iommu=pt"
  3. Save the file
  4. Run the Grub updater. This is very important. Do not forget:
    sudo update-grub
  5. Reboot

This should resolve the issue.

  • I have a question about the live USB part. Do I need to use a live usb or can I use my working 5.4 kernel to modify and update the grub file? – concorde42 Feb 19 at 6:52
  • If the 5.4 kernel option is working, that will require fewer steps 👍🏻 – user1091774 Feb 19 at 6:59
  • I modified the grub file and ran grub update. I am still getting the same error when I boot to kernel 5.8.10 – concorde42 Feb 19 at 7:12

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