[Bug 2091392] Update Released

[Andreas Hasenack]

The verification of the Stable Release Update for livecd-rootfs has
completed successfully and the package is now being released to
-updates.  Subsequently, the Ubuntu Stable Release Updates Team is being
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https://bugs.launchpad.net/bugs/2091392

Title:
  [SRU] Jetson flavor for Core22 Tegra images

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

Bug description:
  [ Impact ]

   * 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 and noble branch in this PPA:
  https://launchpad.net/~rmartin013/+archive/ubuntu/livecd-rootfs-tegra-jetson

  [ Test Plan ]
   * Run the following commands on an arm64 machine installed with jammy
  cd ~
  sudo apt install ./livecd-rootfs_2.765.53_arm64.deb
  git clone https://git.launchpad.net/launchpad-buildd
  sudo apt install -y python3-requests python3-netaddr python3-pylxd
  sudo snap install ubuntu-image --classic
  sudo apt install live-build
  cd launchpad-buildd
  mkdir -p auto
  for s in config build clean; do ln -s /usr/share/livecd-rootfs/live-build/auto/$s auto/; done
  lb clean --purge
  export IMAGEFORMAT=ubuntu-image CHANNEL=edge PROJECT=ubuntu-core ARCH=arm64 SUBARCH=tegra-jetson
  IMAGEFORMAT=ubuntu-image CHANNEL=edge PROJECT=ubuntu-core ARCH=arm64 SUBARCH=tegra-jetson SUITE=jammy lb config
  lb build

   * Install the resulting image on a Jetson device and boot it

  [ Where problems could occur ]

   * As this is only adding a new supported subarch in cdimage, no
  problem is expected with existing arch/subarch.

  [ Other Info ]

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