This bug was fixed in the package debian-installer -

debian-installer (20101020ubuntu451.22) xenial; urgency=medium

  [ dann frazier ]
  * arm64-efi/netboot: Improvements to mini.iso generation:
    - Add an EFI System Partition to fix booting from USB stick on
      same platforms LP: #1692876.
    - Remove no-op arguments -boot-load-size and -boot-info-table.
    - Use simpler "-e" instead of "--efi-boot" since we only have 1
      el torito image.
    - Add -partition_offset 16 so that the output of commands like
      'isosize' is correct.
  * netboot/arm64: Include nic-firmware. LP: #1743638.

  [ Łukasz 'sil2100' Zemczak ]
  * Bump FLOPPY_SIZE on amd64, i386, and powerpc for kernel growth.

 -- Łukasz 'sil2100' Zemczak <>  Wed, 21 Feb
2018 10:43:54 +0100

** Changed in: debian-installer (Ubuntu Xenial)
       Status: Fix Committed => Fix Released

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  ubuntu-server ARM64 ISOs lack partition table with EFI System

Status in Ubuntu CD Images:
  Fix Committed
Status in debian-installer package in Ubuntu:
  Fix Released
Status in debian-installer source package in Xenial:
  Fix Released

Bug description:
  On some arm64/efi platforms, the firmware will not be able to boot from an 
ISO dd'd to a USB stick.

  [Test Case]
  My test is to attach the ISO as an "HD/USB Image" to a Cavium CRB1S w/ AMI 
UEFI firmware using the BMC's Virtual Media. Note that the BMC requires that 
the file be renamed with a ".img" suffix.

  [Regression Risk]
  For d-i, this is aligning the xorriso boot options with the same ones now 
used to build the server ISO. Regression risk has been mitigated by testing on 
real hardware connected as both CD and disk images.

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