Bug#1033678: installation-reports: Unbootable install: MBR partition unusable with UEFI
Hello,
Le 01/04/2023 at 00:41, Dima Kogan wrote:
I got it running by using a friend's usb installer. HIS usb disk was a
valid UEFI boot disk, so I could boot in UEFI mode, and do the normal
install, which completed successfully.
How was this "usb installer" created ?
cp debian-bookworm-DI-alpha2-amd64-netinst.iso /dev/sde
This worked, but apparently this was not a valid UEFI thing.
It is bootable in EFI mode on all UEFI PCs I tested.
Next. Steve McIntyre suggested installing in "expert mode", and then
explicitly creating a GPT partition table. This worked, but I didn't
read his suggestion closely enough, and didn't add an ESP partition.
Anyway the installer partitioner (partman) would not allow to create an
EFI system partition when booted in BIOS/legacy mode, and the boot
loader installer (grub-installer) would not allow to install GRUB for
EFI boot (even though some UEFI firmware accept to boot from a regular
FAT partition, or you may create an EFI partition with fdisk-udeb or
parted-udeb in an installer shell, and you may install grub-efi-amd64
with apt-install in an installer shell).
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