This bug is missing log files that will aid in diagnosing the problem.
While running an Ubuntu kernel (not a mainline or third-party kernel)
please enter the following command in a terminal window:

apport-collect 1968320

and then change the status of the bug to 'Confirmed'.

If, due to the nature of the issue you have encountered, you are unable
to run this command, please add a comment stating that fact and change
the bug status to 'Confirmed'.

This change has been made by an automated script, maintained by the
Ubuntu Kernel Team.

** Changed in: linux (Ubuntu)
       Status: New => Incomplete

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https://bugs.launchpad.net/bugs/1968320

Title:
  Please support self-compressed kernel images on arm64

Status in linux package in Ubuntu:
  Incomplete

Bug description:
  arm64 is currently the only kernel architecture that does not support
  self-compressed kernel images, instead it states that "external"
  things should decompress the kernel image if it is so desired.

  this hinders adoption of arm64, reduces feature parity with other
  architectures, and makes it harder to have optimal kernels on arm64.

  For example:
  - sd-boot stub as used in Ubuntu Core does not support uncompressing .vmlinuz 
section in https://systemd.io/BOOT_LOADER_SPECIFICATION/ type 2 binary

  - firmware on RaspberryPi doesn't support compressed kernel images, or
  only supports a subset of compression algorithms

  - vmlinuz can be booted directly as an EFI app which also doesn't
  support compression, or doesn't support all compression algorithms

  It would be extremely nice to be able to compress vmlinuz on arm64
  with modern compression algorithms (zstd, lz4, xz) and be able to boot
  them the same way one can boot armhf / x86_64 kernels in EFI contexts.

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