[Bug 1944385] Re: REGRESSION: After GRUB update, 32-bit Ubuntu is no more bootable

[Marc Deslauriers]

Thanks for taking the time to report this bug and helping to make Ubuntu
better. We appreciate the difficulties you are facing, but this appears
to be a "regular" (non-security) bug.  I have unmarked it as a security
issue since this bug does not show evidence of allowing attackers to
cross privilege boundaries nor directly cause loss of data/privacy.
Please feel free to report any other bugs you may find.

** Information type changed from Private Security to Public

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Title:
  REGRESSION: After GRUB update, 32-bit Ubuntu is no more bootable

Status in grub2 package in Ubuntu:
  New

Bug description:
  I have 2 32-Bit Ubuntu instances on my machine:
  16.04 ESM
  18.04
  Because it is a 64-bit UEFI machine, I have to use 64-bit Ubuntu to install grub-efi-amd64-signed.
  I used ISO media version 18.04.4.
  The included GRUB version is: 2.02-2ubuntu8.14
  With this version both 32-bit Ubuntu instances can be booted successfully without problems.

  But when I update to the latest security update, I can no more boot the 32-bit instances and I get on the GRUB screen:
  "kernel doesn't support 64-bit CPUs"
  This comes from GRUB version 2.04-1ubuntu44.1.2.

  This is a REGRESSION, and because I cannot use the latest security
  updates, this is a security issue!

  See also: https://lists.gnu.org/archive/html/help-
  grub/2021-09/msg00004.html

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