[Bug 1907085] Autopkgtest regression report (grub2/2.04-1ubuntu26.8)

[Ubuntu SRU Bot]

All autopkgtests for the newly accepted grub2 (2.04-1ubuntu26.8) for focal have finished running.
The following regressions have been reported in tests triggered by the package:

ubuntu-image/1.10+20.04ubuntu1 (s390x, ppc64el, amd64, armhf, arm64)


Please visit the excuses page listed below and investigate the failures, proceeding afterwards as per the StableReleaseUpdates policy regarding autopkgtest regressions [1].

https://people.canonical.com/~ubuntu-archive/proposed-
migration/focal/update_excuses.html#grub2

[1] https://wiki.ubuntu.com/StableReleaseUpdates#Autopkgtest_Regressions

Thank you!

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https://bugs.launchpad.net/bugs/1907085

Title:
  Regression in backup-and-restore patch.

Status in grub2 package in Ubuntu:
  Fix Released
Status in grub2 source package in Bionic:
  New
Status in grub2 source package in Focal:
  Fix Committed
Status in grub2 source package in Groovy:
  Fix Committed
Status in grub2 source package in Hirsute:
  Fix Released

Bug description:
  [Impact]

   * A regression was identified in the backup & restore patch on some
  architectures, which results in garbage filenames to be created in
  /boot/grub.

  The issue is reported on linux-ext4 mailing list https://marc.info/?l
  =linux-ext4&m=160709231522785&w=2

  [Test Case]

   * Execute grub-install --target pc-i386 on i386 machine against a
  nonexistent drive. Such that, backup & restore is triggered.

   * Observe that the restored modules names in /boot/grub do not have
  garbage file endings.

  [Where problems could occur]

   * The generated garbage file endings will remain on disk across
  future upgrade and will need to be cleaned up manually. I am pondering
  if I can clean them up somehow automatically. However the scope of the
  affected machines should be very small and limited to i386.

  [Other Info]
   
   * Reported on linux-ext4 mailing list & debugged by / patch provided by colin watson.

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