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multibooting Linux distros with UEFI Secure Boot

From: Chris Murphy
Subject: multibooting Linux distros with UEFI Secure Boot
Date: Wed, 11 May 2022 11:24:49 -0400


A given NVRAM entry points to a particular distro shim+GRUB, and it's
not possible to use either chainloader or configfile to forward to
another distro's GRUB. If GRUB wants to support the multiboot Linux
case, it needs some way of discovering other distro's shim+GRUB comb
in NVRAM and on the EFI system volume, to populate the GRUB menu. And
then the user can select that distro in the GRUB menu, which causes
GRUB to use --bootnext to do a one-time boot using that UEFI boot
entry, thus loading that distro's signed shim+GRUB combo.

Or, is this just not a priority for the foreseeable future, and users
will have to use the UEFI firmware's built-in boot manager for this
use case?

This seems related to thread: "How to boot Windows when Bitlocker
enabled with key sealed in TPM External"


Chris Murphy

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