[Bug 1983599] Autopkgtest regression report (livecd-rootfs/2.765.9)

[Ubuntu SRU Bot]

All autopkgtests for the newly accepted livecd-rootfs (2.765.9) for jammy have finished running.
The following regressions have been reported in tests triggered by the package:

ubuntu-image/2.2+22.04ubuntu3 (amd64)
livecd-rootfs/2.765.9 (s390x, amd64, arm64, ppc64el)


Please visit the excuses page listed below and investigate the failures, proceeding afterwards as per the StableReleaseUpdates policy regarding autopkgtest regressions [1].

https://people.canonical.com/~ubuntu-archive/proposed-
migration/jammy/update_excuses.html#livecd-rootfs

[1] https://wiki.ubuntu.com/StableReleaseUpdates#Autopkgtest_Regressions

Thank you!

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https://bugs.launchpad.net/bugs/1983599

Title:
  RISC-V cloud images FTBFS after recent StarFive/Nezha changes

Status in livecd-rootfs package in Ubuntu:
  Fix Released
Status in livecd-rootfs source package in Jammy:
  Fix Committed

Bug description:
  [Impact]

  When adding the new RISC-V platforms, some of the generic non-SUBARCH
  code went missing and some invalid assumptions have been made
  (forgetting that we're building RISC-V images that have no SUBARCH),
  causing cloud images to fail building. So this is basically a fix for
  an updates regression.

  [Test Case]

   * Build all our preinstalled RISC-V images with PROPOSED=1 via cdimage and make sure those images build and boot correctly:
     - unleashed
     - starfive
     - nezha
   * Ask the CPC team to build a proposed-enabled cloud image for RISC-V and confirm that it builds correctly

  [Regression Potential]

  The fix here can cause same kind of regressions, so it can cause other
  existing RISC-V images to either not build correctly or build
  unbootable images (test case checks that). A general check of all
  cloud images could be good, since you never know if we didn't break
  something outside of the RISC-V use case (highly unlikely though).

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