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

[Dan Bungert]

** Description changed:

  [ Impact ]
  
   * On arm64 Desktop install ISOs, the message `error: snap "subiquity"
- is not installed` can be observed repeatedly.
+ is not installed` can be observed repeatedly on the console.
  
  [ Test Plan ]
  
  1. Download Noble ARM64 Desktop daily image from cdimage: https://cdimage.ubuntu.com/noble/daily-live/current/.
  2. Boot the ISO in a VM with no graphics. For example, use qemu with -nographic option.
  3. Observe that, after the boot succeed, the console is spamed with errors instead of asking for credentials.
  4. Create a Noble ARM64 Desktop with the proposed livecd-rootfs version. The method is similar than this one: https://docs.google.com/document/d/12eZa2BSbv4cWtj5YN0eoy4LYbEb0LpcW3BWyr1onDtU/edit?tab=t.0.
  5. Run the image in a VM with qemu and -nographic option. after the boot, the console will not get spammed with the error message. The user can log in.
  6. Run this same image with an autoinstall configuration. The installation should succeed.
  7. Run this same image without -nographics. The UI installation should succeed.
  
  [ 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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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 on the console.

  [ Test Plan ]

  1. Download Noble ARM64 Desktop daily image from cdimage: https://cdimage.ubuntu.com/noble/daily-live/current/.
  2. Boot the ISO in a VM with no graphics. For example, use qemu with -nographic option.
  3. Observe that, after the boot succeed, the console is spamed with errors instead of asking for credentials.
  4. Create a Noble ARM64 Desktop with the proposed livecd-rootfs version. The method is similar than this one: https://docs.google.com/document/d/12eZa2BSbv4cWtj5YN0eoy4LYbEb0LpcW3BWyr1onDtU/edit?tab=t.0.
  5. Run the image in a VM with qemu and -nographic option. after the boot, the console will not get spammed with the error message. The user can log in.
  6. Run this same image with an autoinstall configuration. The installation should succeed.
  7. Run this same image without -nographics. The UI installation should succeed.

  [ 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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