Re: Converted MBR to GPT and menu is gone, can't use grub-reboot either

[Andrei Borzenkov]

On 18.02.2023 15:42, Pascal Hambourg wrote:

As expected. An EFI boot loader cannot chainload a legacy boot loader.


Theoretically it can. UEFI Specification defines BIOS Boot device path 
that could "enable platform firmware to select a legacy non-EFI OS as a 
boot option". Whether it is actually implemented by different vendors is 
another question. Sometimes I see in efibootmgr output lines hinting at 
BBS entries.

I do not think that grub supports it though.