On Wed, Sep 13, 2023 at 12:48 PM Goh Lip <[email protected]> wrote: > > > > On 9/13/23 15:15, Andrei Borzenkov wrote: > > On Wed, Sep 13, 2023 at 9:53 AM Goh Lip <[email protected]> wrote: > >> You cannot > >> mix efi and legacy install in the same disk > > > > You most certainly can as long as you have some way to select the boot > > method. You cannot use the same partition both as ESP and BIOS_grub, > > that's true. > > > > > From a boot system of *another* disk or usb? > Certainly not a boot system from that same disk, can it? > A bios-grub and a efi-grub residing in the same disk? Possible? >
Of course it is possible. What makes you think it is not? You can even have both for the same operating system instance using the same common /boot/grub/grub.cfg. > What OP can do now is to make this disk fully uefi (without reinstalling > OS). Create a /boot/efi partition (or use this bios_grub - partition is > big enough), make a /boot/efi entry in /etc/fstab. Redo grub-install (in > uefi). > >
