Question

Is Ubuntu instances boot with EFI or BIOS?

Posted January 30, 2021 515 views
Ubuntu 20.04

Hello, i have created Ubuntu 20.04 instance and during GRUB update i see GRUB was installed for UEFI. Its puzzles me since there is no /sys/firmware/efi in system and Ubuntu already have record of incorrect GRUB updates breaking system.
So, is Ubuntu 20.04 instances is UEFI based or BIOS?

These answers are provided by our Community. If you find them useful, show some love by clicking the heart. If you run into issues leave a comment, or add your own answer to help others.

×
Submit an Answer
1 answer

Hi @nayklost,

You are correct, I just created a droplet and I can see that there is no folder /sys/firmware/efi. Ussually, as you’ve stated as well, the most common way to see if you’ve used UEFI to boot is if you have the folder /sys/firmware/efi.

Another way to see if you are using UEFI is to try and run the command:

efibootmgr

If it returns :

EFI variables are not supported on this system.

Then for sure, it’s not UEFI but BIOS.

Regards,
KFSys

  • I have tried to make new droplet, and while it doesnt have /sys/firmware/efi and efibootmgr returns “EFI variables are not supported on this system.” GRUB updates with installing Grub for EFI and its boots just fine. Thats strange.

    • Hmm, that’s indeed strange, I’ll take a look around and If I find anything noteworthy I’ll add it as a comment.

      Thanks for confirming on your end as well.