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I recently dual-booted Ubuntu and i can't boot into it.

My first time doing this there were no problems. But now there are and i dont know how to fix it. Here are the errors that appear after trying to boot.

error: /boot/vmlinuz-5.4.0-45 has invalid signature

error: you need to load the kernel first.

If you need more information let me know because i dont know what information to give in this situation. Thanks!

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  • Do you get some sort of a prompt, i.e. can you enter commands, like in this answer?
    – Jos
    Sep 1, 2020 at 13:12
  • I was greeted with the error message and after a few seconds it dissapeared. Now im trying to reinstall Ubuntu
    – Tresquel
    Sep 1, 2020 at 13:14
  • Did Windows do an update to UEFI and turn UEFI Secure Boot on?
    – oldfred
    Sep 1, 2020 at 13:51
  • secure boot was always on
    – Tresquel
    Sep 1, 2020 at 14:00
  • @Jos tried to do that things in the answer but the errors are the same
    – Tresquel
    Sep 1, 2020 at 14:17

2 Answers 2

Reset to default
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Disabling Secure Boot solved the problem.

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For those people who may not want to disable Secure Boot permanently

In my case reinstalling shim-signed solved the problem.

First, temporarily disable Secure Boot from the BIOS, then reinstall shim-signed:

sudo apt purge shim-signed
sudo apt install shim-signed

Then re-enable Secure Boot in the BIOS.

Make sure Secure Boot is enabled:

sudo mokutil --sb-state

Also if you have a third-party driver(e.g. Nvidia) you should reinstall the driver and then, a pop-up window will be displayed asking for a password for enrolling key on the next reboot:

enter image description here

Then reboot the system and immediately after reboot you will see something like this:

enter image description here

Select Enroll MOK and then enter the password that you set before.

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