[Bug 2078307] Re: Grub 2.12 in Oracular is unable to boot Windows using chainloader

[haobinnan]

I know that Ubuntu was developed from Debian, so I just tried testing Debian's Grub 2.12 code. With Grub 2 compiled from Debian's code, using chainloader to boot Windows worked successfully.
https://salsa.debian.org/grub-team/grub/-/tree/debian/2.12-5?ref_type=tags
Therefore, I still suspect that certain additional patches in Ubuntu might be causing the issue.

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Title:
  Grub 2.12 in Oracular is unable to boot Windows using chainloader

Status in grub2 package in Ubuntu:
  Confirmed

Bug description:
  I am using Shim 15.8 in combination with GRUB2.12. One of the GRUB
  menu items, chainloader /efi/Microsoft/Boot/bootmgfw.efi, fails to
  boot, while it works correctly with GRUB2.06. Below is a screenshot of
  the error.

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