[canary] installer is not preseeded

Conversely when I boot the non-canary image it immediately launches the installer and does not present the "try or install" selection screen.

The screen is displayed when the installer is started using the --try-or-install option which should be the case if you use the standard desktop unit from desktop as in https://git.launchpad.net/casper/tree/scripts/casper-bottom/61desktop_canary_tweaks#n51

It is because the desktop installer is not pre-installed on Canary and /snap/ubuntu-desktop-installer doesn't exist at casper time, so script 61 exits early.

We defined the check at the time as a way to tell apart the desktop legacy installer vs the new installer.

The assumption was that the installer snap would be available because pre-seeded was done at image build time (to improve live session start performance). Things are different in the canary case and we can't do the preseeding at image build anymore there right?

If so we need to change the

if [ ! -d /root/snap/ubuntu-desktop-installer/ ]; then
    exit 0
fi

to some other condition. Any idea? Maybe we should just make livecd-rootfs create a new file for any of the ubuntu-desktop-installer based image and check for that file instead?

That's fine I think. The installer must be pre-installed anyway otherwise it takes too much time to start the session.

likely of duplicate of https://bugs.launchpad.net/bugs/2028888

AIUI this is fixed by livecd-rootfs 23.10.26 in -proposed.

livecd-rootfs (23.10.26) mantic; urgency=medium

  [ Łukasz 'sil2100' Zemczak ]
  * Update the enhanced-sb layer model to not preinstall the printing snaps,
    per changes to seeds. Live layer model not changed as it will go away
    soon per our staged changes.

  [ Michael Hudson-Doyle ]
  * Use a traditional seed.yaml style seed for the canary installer's live

 -- Łukasz 'sil2100' Zemczak <email address hidden> Mon, 28 Aug 2023 12:13:38 +0200

Confirmed working with the 20230829 canary image.