[Bug 2037644] Re: Issues with Multibooting

[Julian Andres Klode]

Please try the -10ubuntu2 that was released just now (might take a
couple hours).

Not being able to load Fedora is expected, as Fedora kernels are not
signed by Ubuntu and Windows  also only works if you do not use
Bitlocker as otherwise the measurements the disk is sealed against will
be wrong with shim and grub in the boot path.

It is strongly recommended to use the UEFI Firmware boot menu to select
the OS you want to boot as that ensures that it works correctly,
including secrets and hard disk encryption like Bitlocker sealed to a
TPM.

** Changed in: grub2 (Ubuntu)
       Status: Confirmed => Incomplete

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https://bugs.launchpad.net/bugs/2037644

Title:
  Issues with Multibooting

Status in grub2 package in Ubuntu:
  Incomplete

Bug description:
  Multiboot machine with Ubuntu, Fedora & Win 11. After updating Ubuntu to 23.10 beta (grub2 to 2.12~rc1-4ubuntu3) I get 
  1) Win11:  BSOD error code 0xc0000428
  2) Fedora: error: bad shim signature.
             error: you need to load the kernel first
  3) Ubuntu: loads but seems to have some gpu(nvidia) driver issue (not important for this bug)

  I can resolve the Win11 error by turning secure boot on (but not the
  Fedora issue)

  However, changing to boot order to start with Fedora (39 beta) which
  still uses grub 2.06 all of the OS's boot with secure boot off.

  so there is an issue with grub2 2.12

  Please fix

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