[Bug 1435663] Re: arm64/efi support

[Sven Baars]

After installing this update my system won't boot any more with the
message

"The system found unauthorized changes on the firmware, operating system
or UEFI drivers.

Press [N] to run the next boot device, or enter directly to BIOS Setup if there are no other boot devices installed.
Go to BIOS Setup > Advanced > Boot and change the current boot drive into other secured boot devices. "

I'll try to fix this now, but this doesn't look like intended behaviour
from an SRU.

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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 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 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 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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