[Bug 2037644] Re: Issues with Multibooting

[kq4zj]

I have similar problem 
Multi boot machine with Ubuntu grub2 version 2.12~rc1-4ubuntu3

I have secure boot disabled.
I have Win 11 22H2 on (sdb) and Linux Mint, MX-23 KDE, and (ubuntu-23.10-beta-desktop-amd64.iso	2023-09-20 00:42) on (sda)

sdb1,sdb2,sdb3,sdb4 Windows EFI,MRS,Windows and recovery.
Disk 1 only Windows stuff.
Disk 0 has Linux partitions
sda1 EFI, sda2 Ubuntu 23.10 beta, sda3 Linux Mint 21.2, sda4, MX-23

I also have rEFInd version 0.14.0.2-1 installed on sda1 EFI partiton.
I can chain load windows and all Linux OS's with rEFInd grub, MX-23 grub.
Ubuntu 23.10 beta with GRUB 2.12~rc1 will not chain load windows. gives me a BSOD

I found a temporary fix in a bug posted in bugs.launchpad(dot net)
+source/grub2/+bug/2030810

#8
On Ubuntu, I have integrated following workaround (ugly, but it works actually).
Edit the file with sudo vim /boot/grub/grub.cfg and insert "rmmod peimage" on the menuentry for booting Windows.

menuentry 'Windows Boot Manager (on /dev/nvme0n1p1)' --class windows --class os $menuentry_id_option 'osprober-efi-8050-6F7A' {
        insmod part_gpt
        insmod fat
        rmmod peimage
        search --no-floppy --fs-uuid --set=root 8050-6F7A
        chainloader /EFI/Microsoft/Boot/bootmgfw.efi


this fix works for me

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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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