EFI support in the kernel

[Rashkae]

On 2020-01-26 7:58 a.m., Ken D'Ambrosio wrote:
> your system booting UEFI, you have to have your BIOS thusly configured,
> AND do a UEFI-based install at installation time.  (The install used to
> require you to select UEFI from the GRUB menu at install time; I think
> Ubuntu may have enough smarts now to simply pick the default.)  But I
> don't see anything approaching an even vaguely easy way to do this
> retroactively: you need to change your disk layout (need an EFI
> partition), need to populate it, change your BIOS from "legacy" to
> "(U)EFI", etc.  I do not see there being anything but pain and suffering
> trying to make this happen post-facto.

The Boot Repair CD has a utility that will step your through the process
of changing Boot from BIOS to grub post install.  It's not entirely
automatic, but it's not horribly painful either.  You still need to
create an EFI Boot partition. (100 to 200MB, Fat32).

If your hard boot drive is using MBR parition table instead of GPT. you
can use gdisk to convert it.  Note that you should have good backups
before trying this.


Boot Repair CD: https://sourceforge.net/projects/boot-repair-cd/