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[Launchpad Bug Tracker <1684341@xxxxxxxxxxxxxxxxxx>]

This bug was fixed in the package grub2 - 2.02~beta3-4ubuntu3

---------------
grub2 (2.02~beta3-4ubuntu3) artful; urgency=medium

  * debian/patches/install_signed.patch, grub-install-extra-removable.patch:
    - Make sure if we install shim; it should also be exported as the default
      bootloader to install later to a removable path, if we do.
    - Rework grub-install-extra-removable.patch to reverse its logic: in the
      default case, install the bootloader to /EFI/BOOT, unless we're trying
      to install on a removable device, or explicitly telling grub *not* to
      do it.
    - Move installing fb$arch.efi to --no-extra-removable; as we don't want
      fallback to be installed unless we're also installing to /EFI/BOOT.
      (LP: #1684341)

 -- Mathieu Trudel-Lapierre <cyphermox@xxxxxxxxxx>  Wed, 26 Apr 2017
21:08:22 -0400

** Changed in: grub2 (Ubuntu)
       Status: In Progress => Fix Released

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https://bugs.launchpad.net/bugs/1684341

Title:
  EFI fallback binary should not be installed in --removable mode

Status in grub2 package in Ubuntu:
  Fix Released
Status in grub2 source package in Trusty:
  New
Status in grub2 source package in Xenial:
  New
Status in grub2 source package in Yakkety:
  New
Status in grub2 source package in Zesty:
  In Progress

Bug description:
  [Impact]
  Building some images depending on calling grub-install --removable still installs fbx64.efi; which we don't want on removable media.

  [Test case]
  On an EFI system, run 'grub-install --removable --target=x86_64-efi'. Observe whether fbx64.efi is installed to /boot/efi/EFI/BOOT. It should not.

  [Regression potential]
  If any system is depending on running grub-install with --removable, and on fbx64.efi being installed in /boot/efi/EFI/BOOT; this would cause this assumption to fail -- leading to incorrect fallback behavior when BootEntries are not present on a system.

  Failures to boot with "System BootOrder not found" errors should be
  considered a possible regression.

  Any missing files in /boot/efi/EFI/BOOT or /boot/efi/EFI/ubuntu after
  install should be considered a potential regression of this update.

  
  ----

  
  The patch I did to fix names for the new naming of shim binaries included the addition of fbx64.efi; but it was done wrong: fbx64.efi should only exist under \EFI\BOOT, it's not required in the "removable" path; except if we're trying to force installing to the removable path *too*.

  In other words:
  1) we normally don't want /EFI/ubuntu/fbx64.efi to exist;

  and
  a) on a desktop or server, we want /EFI/BOOT/fbx64.efi to exist (ie. installs without --removable, and with --force-extra-removable used when grub-install was called);
  b) on removable media, we do not want /EFI/BOOT/fbx64.efi to exist (ie. when grub-installed is called with --removable).

  Furthermore, the (a) case is probably not the typical case we want to
  run grub-install with. Calls to grub-install with --force-extra-
  removable probably should be limited to shim-signed's postinst.

  In any case, let's move the fbx64.efi installation step to
  also_install_removable() in grub-installer to avoid installing it when
  it shouldn't be.

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