[Bug 1632473] Re: arm64 grub needs to load gzio

[Launchpad Bug Tracker]

** Branch linked: lp:~ubuntu-core-dev/debian-installer/xenial-proposed

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https://bugs.launchpad.net/bugs/1632473

Title:
  arm64 grub needs to load gzio

Status in Ubuntu CD Images:
  New
Status in debian-installer package in Ubuntu:
  Fix Released
Status in debian-installer source package in Xenial:
  In Progress

Bug description:
  [Impact]
  Ubuntu Server ISO fails to boot on arm64/efi systems.

  [Test Case]
  Boot the ISO on an arm64 system and select the "Install Ubuntu" option.
  Normally you'd expect Linux to boot and the installer screen to be displayed.
  However, with this bug, instead you will see:

  error: invalid magic number.
  unaligned pointer 0xb84630e8
  Aborted. Press any key to exit.

  This is due to the arm64 kernel now being gzip'd (See LP: #1384955),
  and GRUB not having loaded the gzio module. Whatever generates the
  grub.cfg for the cdimages likely needs to be updated to load this
  module in advance of loading the kernel.

  Workaround:
   - At the GRUB menu, press "c" to enter the GRUB shell
   - At the shell, run 'insmod gzio'
   - Press escape to return to the GRUB menu
   - Make your boot selection as per normal.

  [Regression Risk]
  This is just adding an additional GRUB module to the installer GRUB image. We've been shipping this in installers since 16.10 w/o any reports of issues.

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