[Bug 2073772] Re: rpool fails to import on first boot after automated install (failed PRE_SHUTDOWN?)

[Olivier Gayot]

** Changed in: subiquity (Ubuntu)
       Status: In Progress => Fix Committed

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https://bugs.launchpad.net/bugs/2073772

Title:
  rpool fails to import on first boot after automated install (failed
  PRE_SHUTDOWN?)

Status in subiquity package in Ubuntu:
  Fix Committed

Bug description:
  After installing 24.04 with a zfs root, the system fails on first boot
  with an error that the rpool belongs to another system. This suggests
  that the installer is failing to export the pools after the install is
  complete. The zpool import must be manually forced for the boot to
  proceed, as in attached screenshot.

  For greater context: I work with an infrastructure in which we network
  boot machines from the ubuntu server ISO with a preseed to automate
  the OS installation on our bare metal. The intended result is that we
  can flag a server to be reinstalled, reboot it, and then wait until it
  comes back up with a clean install, no user intervention required or
  desired. For the 22.04 images this works fine and the server will
  install and reboot cleanly. For the 24.04 installer, it doesn't,
  because of the above error with the zpool after reboot. The same
  preseed that produces a booting system from the 22.04(.4) ISO results
  in failure for the 24.04 version.

  This seems to be the same ultimate failure mode as in
  https://bugs.launchpad.net/subiquity/+bug/2049761, albeit in that
  issue the reporting user used the desktop installer and it appears
  they may have rebooted the system before the installer was completely
  finished. That can't be the case for us as we're using the installer
  fully automated and it is choosing if and when it restarts.

  I will attach the installer-journal.txt log from the host, though
  obviously that only extends as far as the moment the installer copies
  its logfiles into the target. As the installation is done via
  netbooting the ISO the installer environment itself is entirely
  ephemeral so the complete logs from installation media are not
  available.

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