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[Launchpad Bug Tracker <2038957@xxxxxxxxxxxxxxxxxx>]

This bug was fixed in the package livecd-rootfs - 24.04.2

---------------
livecd-rootfs (24.04.2) noble; urgency=medium

  * Enable snap preseeding with ppc64el images where /boot/vmlinux is used
    instead of /boot/vmlinuz. (LP: #2038957)

 -- Philip Roche <phil.roche@xxxxxxxxxxxxx>  Thu, 26 Oct 2023 17:56:00
+0100

** Changed in: livecd-rootfs (Ubuntu)
       Status: Fix Committed => Fix Released

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https://bugs.launchpad.net/bugs/2038957

Title:
  ppcel64 images unpack to /boot/vmlinux not /boot/vmlinuz leading to
  kernel feature mismatch

Status in livecd-rootfs package in Ubuntu:
  Fix Released
Status in livecd-rootfs source package in Xenial:
  Won't Fix
Status in livecd-rootfs source package in Bionic:
  Won't Fix
Status in livecd-rootfs source package in Focal:
  Won't Fix
Status in livecd-rootfs source package in Jammy:
  Fix Committed
Status in livecd-rootfs source package in Lunar:
  Won't Fix
Status in livecd-rootfs source package in Mantic:
  Fix Committed

Bug description:
  In a build of a ppcel64 image, snap_validate_seed fails to find the
  installed kernel to pick a matching apparmor feature set to mount.
  from the log

  ```
  + [ -e chroot/boot/vmlinuz ]
  + [ -e chroot/var/lib/snapd/seed/seed.yaml ]
  + snap debug validate-seed chroot/var/lib/snapd/seed/seed.yaml
  + realpath chroot
  + /usr/lib/snapd/snap-preseed --reset /build/chroot
  ubuntu classic preseeding
  unmounting: /build/chroot/tmp/snapd-preseed
  ubuntu classic preseeding
  unmounting: /tmp/snapd-preseed
  + realpath chroot
  + /usr/lib/snapd/snap-preseed /build/chroot
  ubuntu classic preseeding
  ```

  This corresponds to line 772 in livecd-rootfs/live-build/functions

  snap_validate_seed() {
      local CHROOT_ROOT=$1
      local kern_major_min=undefined

      if [ -e ${CHROOT_ROOT}/boot/vmlinuz ]; then

  ppcel64 however unpacks to /boot/vmlinux. For history:

  https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1358920

  for ppcel64 images, this function needs to be updated to check for
  `/boot/vmlinux`.

  This will require an SRU 23.10 (post-release) and 22.04

  SRU
  ====

  [ Impact ]

   * ppc64el Users of the 6.5 kernel will have un-optimized first boot
  experiences due to snaps not preseeding with the correct apparmor
  setup. This directly affects clouds, leading to boot speed degradation
  of anywhere from 10-30s (depending on snaps installed)

  [ Test Plan ]

   * Build test ppc64el images and test that presenting was correctly
  applied for the 6.5 kernel

  [ Where problems could occur ]

   * If the optimized preseeding of the snaps for ppc64el continues to
  fail

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