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  • Are you able to start the kernel image directly from EFI? (For example, by adding it as a bootloader via efibootmgr, or by starting it from EFI Shell?) Commented Aug 12, 2020 at 14:11
  • How does that make a difference?
    – fiscblog
    Commented Aug 12, 2020 at 14:56
  • I don't know Debian, but is it possible that you're signing a different vmlinuz... than grub is trying to boot? Is /boot/vmlinuz a symlink to somewhere else, as a part of package management for instance? Commented Aug 18, 2021 at 18:53