Comment 168 for bug 1886148

Hi,

has it already been tested whether a grub-mkrescue ISO boots to a
GRUB prompt ?

To try it, install

  grub-common grub-pc-bin grub-efi-amd64-bin

run

  mkdir minimal
  touch minimal/empty-file.txt
  grub-mkrescue -o output.iso minimal

and use output.iso like groovy-desktop-amd64.iso.

No menu or so is to be expected. Only "grub> _".
  https://i.stack.imgur.com/DEL0D.jpg

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I really doubt that it makes a difference, but if a grub-mkrescue ISO
boots, we could try its pure GPT partition table by xorriso -as mkisofs
option

  -appended_part_as_gpt

which produces a "Protective MBR" partition table which indicates a
valid GPT.

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If GPT does not boot either, then the difference must be in the EFI
partition. Either its storage location or its content.

The location could be tested by a stripped-down groovy-desktop-amd64.iso
with fewer payload but full boot equipment.

About the content of the EFI partition i cannot say much.

Have a nice day :)

Thomas