[Bug 2043995] Re: fix grub-install to not write modules to /boot before we know we have a valid disk target

[Launchpad Bug Tracker]

This bug was fixed in the package grub2 - 2.12~rc1-12ubuntu3

---------------
grub2 (2.12~rc1-12ubuntu3) noble; urgency=medium

  * d/p/delay-copying-to-grubdir.patch: Improve grub-install robustness by
    delaying the update of /boot after install device validation
  * Remove workaround for LP: 1889556 (LP: #2043995)
    - Was not needed since /boot rollback was introduced upstream
    - Patch above ensures that this will not reoccur even if rollback fails

 -- Mate Kukri <mate.kukri at canonical.com>  Tue, 21 Nov 2023 15:35:55
+0000

** Changed in: grub2 (Ubuntu Noble)
       Status: Fix Committed => Fix Released

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https://bugs.launchpad.net/bugs/2043995

Title:
  fix grub-install to not write modules to /boot before we know we have
  a valid disk target

Status in grub2 package in Ubuntu:
  Fix Released
Status in grub2 source package in Noble:
  Fix Released

Bug description:
  grub2 2.04-1ubuntu26.2 in 2020 introduced a workaround in focal for
  the fact that grub2 would write updated modules to /boot/grub, and
  only afterwards check that it had a valid disk target for installation
  of the first stage bootloader, with the result that if the debconf
  config for grub was outdated and points at a device that no longer
  exists, and there is ABI skew between the 1st/2nd stage bootloader and
  the grub modules from the new package, the system becomes unbootable
  because it is unable to load modules from the /boot filesystem, and
  rollback is not possible (LP: #1889556).

  This was supposed to be a workaround, but the work was never done to
  fix grub-install behavior to avoid this detectable and avoidable
  failure.

  We need grub-install to validate the target disk, and if it is
  unavailable, abort BEFORE updating /boot/grub with incompatible
  contents.

  Once this is done, the postinst hack that skips grub-install for grub-
  pc should be dropped.

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