[Bug 2083554] Re: error: snap "subiquity" is not installed

[Dan Bungert]

Can the builds you do, Antoine, work with livecd-rootfs from noble-
proposed?

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https://bugs.launchpad.net/bugs/2083554

Title:
  error: snap "subiquity" is not installed

Status in livecd-rootfs package in Ubuntu:
  Fix Released
Status in livecd-rootfs source package in Noble:
  New

Bug description:
  [ Impact ]

   * On arm64 Desktop install ISOs, the message `error: snap "subiquity"
  is not installed` can be observed repeatedly.

  [ Test Plan ]

   * Testing something like this prior to merge to the archive is difficult.  We can demonstrate that builds in a PPA succeed, but that fails to provide full confirmation that the resulting ISO is healthy.
   * ???

  [ Where problems could occur ]

   * As usual, the risk is never zero
   * We are deleting files not in use by the desktop install ISO.  If this was done incorrectly, we could harm the install.

  Original bug report follows.

  ---

  On arm64, using the Oracular daily build "20241001", the message
  `error: snap "subiquity" is not installed` can be observed repeatedly.

  ...
  Oct 02 16:03:19 ubuntu systemd[1]: Started serial-getty at ttyAMA0.service - Subiquity, the installer for Ubuntu Server ttyAMA0.
  Oct 02 16:03:19 ubuntu systemd[1]: serial-getty at ttyAMA0.service: Main process exited, code=exited, status=1/FAILURE
  Oct 02 16:03:19 ubuntu systemd[1]: serial-getty at ttyAMA0.service: Failed with result 'exit-code'.
  Oct 02 16:03:19 ubuntu systemd[1]: run-credentials-serial\x2dgetty\x40ttyAMA0.service.mount: Deactivated successfully.
  Oct 02 16:03:20 ubuntu systemd[1]: serial-getty at ttyAMA0.service: Scheduled restart job, restart counter is at 3155.
  Oct 02 16:03:20 ubuntu systemd[1]: Started serial-getty at ttyAMA0.service - Subiquity, the installer for Ubuntu Server ttyAMA0.
  Oct 02 16:03:20 ubuntu systemd[1]: serial-getty at ttyAMA0.service: Main process exited, code=exited, status=1/FAILURE
  Oct 02 16:03:20 ubuntu systemd[1]: serial-getty at ttyAMA0.service: Failed with result 'exit-code'.
  Oct 02 16:03:20 ubuntu systemd[1]: run-credentials-serial\x2dgetty\x40ttyAMA0.service.mount: Deactivated successfully.
  Oct 02 16:03:20 ubuntu systemd[1]: serial-getty at ttyAMA0.service: Scheduled restart job, restart counter is at 3156.
  ...

  If `serial-getty at ttyAMA0.service` is masked, the situation improves.
  References to the subiquity snap should be removed from chroot overlay files for Ubuntu Desktop.

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