(Not replying to the submitter because gmail rejects all my mails)
On Mon, 22 Aug 2022 10:58:06 +0800 Chew Kean Ho
<hollowaykea...@gmail.com> wrote:
When performing a manual grub-install in a debootstrap Debian OS setup,
installing SecureBoot Grub with --bootloader-id value other than 'debian' causes
the Grub to drop into Grub Shell (failed to locate /boot/grub/grub.cfg) despite
having the UUID and root prefix values correct at /boot/EFI/<name>/grub.cfg
level.
This bug should be partially fixed since version 2.06-3~deb11u5 as a
lucky side effect of embedding a grub.cfg into memdisk.
Exact cause is unknown (still not sure what causes the drop). The only
workaround is NOT to mess with the --bootloader-id or set --bootloader-id to
strictly 'debian' as value.
The cause is well known, see #925309. (maybe merge the two bugs ?)
<https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=925309>
An effective workaround was to copy /boot/EFI/<name>/grub.cfg into
/boot/EFI/debian/ where GRUB expected to find it.
The same thing happens when SecureBoot is turned off at BIOS.
If secure boot is disabled, another workaround was to install GRUB
without secure boot support, either by removing shim-signed or by
running grub-install --no-uefi-secure-boot.
