[Bug 2091392] Re: Jetson flavor for Core22 Tegra images

[Loïc Minier]

NB: there won't ever be Oracular Tegra images, we will go directly from
5.15 + 22.04 to 6.8 kernels and 24.04, so dropping the oracular target.

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Title:
  Jetson flavor for Core22 Tegra images

Status in livecd-rootfs package in Ubuntu:
  Fix Released
Status in livecd-rootfs source package in Jammy:
  In Progress
Status in livecd-rootfs source package in Noble:
  Triaged
Status in livecd-rootfs source package in Oracular:
  Won't Fix

Bug description:
  Hi,

  This is an SRU bug for a trivial change to add a arm64+tegra-jetson
  entry to the list of supported subarches for Tegra.

  Ubuntu for Tegra jammy images are built using mostly standard cdimage/Launchpad/livecd-rootfs toolkit. For a while, we were focusing on arm64+tegra-igx as the target flavor both for Ubuntu Server 22.04 and for Ubuntu Core 22 images, but unfortunately have to decouple from this name as explained here:
  https://discourse.ubuntu.com/t/changes-to-ubuntu-for-tegra-kernel-metapackages-on-jetson-and-igx/48807

  The UC22 images were being built using the normal jammy livecd-rootfs and arm64+tegra-igx. The Server 22.04 images were built using ubuntu-image 3.x which wasn't supported in jammy's livecd-rootfs, so we're using an unmodified backport of the latest livecd-rootfs version from plucky to jammy that lives in this PPA:
  https://launchpad.net/~ubuntu-tegra/+archive/ubuntu/updates

  For UC22, we have these changes to the devel livecd-rootfs in plucky with version 25.04.4:
  https://launchpadlibrarian.net/760458882/livecd-rootfs_25.04.3_25.04.4.diff.gz
  NB: we've considered using a backport of this package as for classic images, but it defaults to UC24 and can't built UC22 anymore, so that wouldn't be adequate

  I've prepared the same changes to the jammy branch in this PPA:
  https://launchpad.net/~ubuntu-tegra/+archive/ubuntu/tegra-jetson-sru/+packages?field.name_filter=&field.status_filter=superseded&field.series_filter=
  debdiff:
  https://launchpadlibrarian.net/760458882/livecd-rootfs_25.04.3_25.04.4.diff.gz

  TODO:
  - complete SRU template
  - consider need for other SRUs (noble, oracular)

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