Re: BIOS_grub GUID signature within an EFI partition?

[Goh Lip]

On 14/09/2023 02:35, Bret Busby wrote:

> So, Legacy BIOS can be used to install operating systems, on the same
> "hard drive", that has a UEFI installed operating system, and, that has
> an EFI partition.
>
> That is, on computers that have Legacy BIOS available.


Not playing Monty Python with you :) and I think this is an important
thing to you,

When you booted up to a linux OS that you think is legacy-bios, verify
if indeed it is by the following command in the terminal

test -d /sys/firmware/efi && echo UEFI || echo BIOS

If output is "UEFI", you are booted in uefi, There is nothing wrong as I
too have booted legacy-bios OS from a uefi grub. The problem arises when
we do a 'grub-install' like when there is a new version of grub to
update. The system will then install to the UEFI version of GRUB and use
your ‘0xEF02’ partition as the efi partition. I think this is what
happened in your case.

Cheers.