Public bug reported:

[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.

** Affects: grub2 (Ubuntu)
     Importance: Undecided
         Status: New

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

Title:
  Regression in backup-and-restore patch.

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