[Bug 1863145] Re: arm64 cloud image contains flash-kernel which leads to apt errors on upgrade

[Dave Jones]

Some test packages for focal and bionic are available from the following
PPA:

https://launchpad.net/~waveform/+archive/ubuntu/flash-kernel/+packages

The relevant branches are:

https://code.launchpad.net/~waveform/ubuntu/+source/flash-kernel/+git
/flash-kernel/+ref/no-lxc-focal

https://code.launchpad.net/~waveform/ubuntu/+source/flash-kernel/+git
/flash-kernel/+ref/no-lxc-bionic

In the focal version I've also taken the liberty of excising
FLASH_KERNEL_SKIP as it's no longer used by anything in focal (it's only
used by the ac100 platform in bionic), which reduces our delta with
upstream. In both versions, the test for containers is moved from the
initramfs and kernel hooks into flash-kernel itself. This should fix the
upgrade issue, but do let me know if any other issues crop up in
testing!

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https://bugs.launchpad.net/bugs/1863145

Title:
  arm64 cloud image contains flash-kernel which leads to apt errors on
  upgrade

Status in cloud-images:
  Confirmed
Status in flash-kernel package in Ubuntu:
  Confirmed
Status in livecd-rootfs package in Ubuntu:
  Confirmed

Bug description:
  To reproduce on ARM:

  $ lxc launch ubuntu:18.04 container
  $ lxc shell container
  # apt update
  # apt upgrade

  Will return error due to presence of the flash-kernel package.

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