Does the Ubuntu kernel have EFI stub loader boot support?

Question

This question is regarding efistub booting.

I would like load the stock pre-compiled Ubuntu kernel directly from UEFI firmware its boot menu, using efiboogmgr.

Since which Ubuntu version can this be done without the need for a separate bootloader?

Answer 1

12.10 and newer

All Ubuntu kernels built since kernel 3.3.0 have included the EFI stub loader feature in the kernel. That means all Ubuntu releases since 12.10.

Background

Kernel build configuration can be checked with command f.e.

• zcat /proc/config.gz | grep EFI_STUB, or
• for release 18.0 and later with cat /boot/config-$(uname -r) | grep EFI_STUB