After reading log in #14, and some code from cloud-init and maas
I still cannot find any code that will let cloud-init try to install 
flash-kernel wtih zfsutils-linux.
and it seems the error because squashfs didn't have any kernel installed.
So `linux-version` cannot find any kernel version to pass to flash-kernel to 
process postinst script.
`Can't find /boot/vmlinuz- (see /tmp/flash-kernel-no-kernel-error.log)` $kvers 
is empty.

and as I know, squashfs only for temp utils?
It will create an environment for curtin to install real system into disk
Am I correct?

Do you have any custom cloud-init config for xgene?


> RE: EFI-STUB - GRUB is the default way to boot Ubuntu on EFI systems. Users 
> can choose to boot using EFI-STUB, but they can also remove any Recommended 
> packages. Adding grub-efi-arm64 to Recommends will also get arm64 on-par with 
> amd64, which also recommends GRUB.

Got it.

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https://bugs.launchpad.net/bugs/1918427

Title:
  curtin: install flash-kernel in arm64 UEFI unexpected

Status in cloud-images:
  Incomplete
Status in curtin package in Ubuntu:
  New
Status in linux package in Ubuntu:
  In Progress

Bug description:
  I used APM Mustang which flash-kernel supported in u-boot mode.
  But I used it with UEFI environment.
  It will cause fatal error when I used ARM64 ubuntu live server ISO to install 
system.

  In code[1], this will not install `flash-kernel` for APM Mustang because of 
UEFI.
  So that means code[2] will not disable `flash-kernel` in target system, only 
disable `update-initramfs`.

  When curtin execute to `install_kernel` stage, code[3,4] will not install 
`flash-kernel` either.
  But in code[5], it will install `linux-generic`.
  `linux-generic` has a long dependency tree and it will get `flash-kernel` in 
Recommended field.
  Apt by default will install Recommended package before kernel is installed.[6]
  So it will still execute `zz-flash-kernel` and `flash-kernel` when installing 
kernel.
  But system didn't create any `initrd.img` ever because curtin disable 
`update-initramfs` in code[2].
  This will cause that `flash-kernel` cannot find `initrd.img.<kvers>` and fail 
when installing it.

  This issue didn't effect all ARM64 UEFI platform because `flash-kernel` 
didn't support them and skip.[7]
  I'm not sure which is best solution for this.
  But I think we should apply PR-27 in `flash-kernel`[8] for enhancement and 
fix curtin process with this patch both.

  If we only apply PR-27, it should work fine as well because it will be 
skipped when detecting UEFI
  and install `flash-kernel` before `disable_update_initranfs` in ARM platform 
without UEFI.[9]

  [Patch-1,2,3] might have side effect.
  Picking one patch for curtin should be enough.
  But I need your advice for this to determine which one is better for curtin.
  There are two categories
  1. avoid installing flash-kernel if no need, [Patch1,2]
  2. always install flash-kernel in arm/arm64 and make sure it be installed 
before code[2] [Patch3]
  (I will attach patch in reply.)

  Thanks a lot
  Regards,
  Date

  [1] 
https://github.com/canonical/curtin/blob/master/curtin/deps/__init__.py#L57-L58
  [2] 
https://github.com/canonical/curtin/blob/master/curtin/commands/curthooks.py#L1693-L1699
  [3] 
https://github.com/canonical/curtin/blob/master/curtin/commands/curthooks.py#L365-L370
  [4] 
https://github.com/canonical/curtin/blob/master/curtin/commands/curthooks.py#L311-L327
  [5] 
https://github.com/canonical/curtin/blob/master/curtin/commands/curthooks.py#L372-L374
  [6] https://github.com/Debian/apt/blob/master/apt-pkg/init.cc#L132
  [7] 
https://salsa.debian.org/installer-team/flash-kernel/-/blob/master/functions#L787
  [8] https://salsa.debian.org/installer-team/flash-kernel/-/merge_requests/27
  [9] curtin will insert `flash-kernel` into `REQUIRED_EXECUTABLES` when system 
is arm/arm64 without UEFI.

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