Re: Help making .ISO bootable bios and UEFI

[Pascal Hambourg]

Le 09/01/2020 à 20:16, larry a écrit :
> On Wed, 8 Jan 2020 20:31:22 +0100 Pascal Hambourg wrote:
>
> > Why then are you bothering to make an ISO image ? The ISO 9660 format is
> > useful only on optical media. You can use a USB flash drive just like
> > any other disk drive.
>
> The iso boots with no problems from a USB flash drive on machines using 
> BIOS.

It is not the ISO part that boots, it is the MBR part of an hybrid 
image. A pure ISO filesystem is not bootable on a USB flash drive, only 
on an optical disc.

> I need it to also boot on machines using UEFI.

Create an EFI partition, mount it as /boot/efi and install GRUB with 
--removable.