[Bug 1435663] [grub2/trusty] possible regression found

[Ubuntu Foundations Team Bug Bot]

As a part of the Stable Release Updates quality process a search for
Launchpad bug reports using the version of grub2 from trusty-proposed
was performed and bug 1447295 was found.  Please investigate this bug
report to ensure that a regression will not be created by this SRU. In
the event that this is not a regression remove the "verification-failed"
tag from this bug report and tag 1447295 "bot-stop-nagging". Thanks!

** Tags added: verification-failed

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https://bugs.launchpad.net/bugs/1435663

Title:
  arm64/efi support

Status in efibootmgr package in Ubuntu:
  Fix Released
Status in grub-installer package in Ubuntu:
  Fix Released
Status in grub2 package in Ubuntu:
  Fix Released
Status in grub2-signed package in Ubuntu:
  Fix Released
Status in libdebian-installer package in Ubuntu:
  Fix Released
Status in partman-auto package in Ubuntu:
  Fix Released
Status in partman-efi package in Ubuntu:
  Fix Released
Status in efibootmgr source package in Trusty:
  Fix Committed
Status in grub-installer source package in Trusty:
  Fix Committed
Status in grub2 source package in Trusty:
  Fix Committed
Status in grub2-signed source package in Trusty:
  Fix Committed
Status in libdebian-installer source package in Trusty:
  Fix Committed
Status in partman-auto source package in Trusty:
  Fix Committed
Status in partman-efi source package in Trusty:
  Fix Committed
Status in efibootmgr source package in Utopic:
  Fix Released
Status in grub-installer source package in Utopic:
  Fix Committed
Status in grub2 source package in Utopic:
  Fix Released
Status in grub2-signed source package in Utopic:
  Fix Released
Status in libdebian-installer source package in Utopic:
  Fix Committed
Status in partman-auto source package in Utopic:
  Fix Committed
Status in partman-efi source package in Utopic:
  Fix Committed

Bug description:
  [Impact]
  It is currently not possible to install EFI-based arm64 systems.

  [Test Case]
  Install an arm64 system with d-i. On reboot you should have a new "ubuntu" entry in the EFI boot menu that starts GRUB and boots into Linux. This can be tested in QEMU if hardware is not available:
    https://wiki.ubuntu.com/ARM64/QEMU
  Note that kernel support is also required, so you'll need to use an LTS Enablement kernel. 

  [Regression Risk]
  Most of the required changes involve enabling builds/backporting code that will only run on previously-unsupported systems. The biggest risk I see is in breaking previously-supported arm64 systems - luckily there's only a few of those and we can test them.

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