[Bug 2147086] [NEW] [SRU] Fix noble image by dropping unused sb build

[Didier Roche-Tolomelli]

Public bug reported:

[ Impact ]

  * The current noble image fails to build since we try to build a snap
model for sb. This one used to be synced by the Cloud team which doesn’t
need it anymore.

  * We moved our snaps to core24, which means that this now unused
models would need to be updated, signed, and included in the new livecd-
rootfs for every snaps transition. The goal is to minimize now the
maintainance cost by avoiding doing this update and remove it for future
transition, as this is not used at all anymore.

  * The impact is at ISO build time. The option from the installer using
that model has never been available by our end user.

[ Test Plan ]

 1. Start a noble image build
 2. Ensure the build is succesful
 3. Try to install this Ubuntu desktop image. Installation should be successful
 4. After rebooting on the installed system, the model "classic-model.model" should no be present on the system.


[ Where problems could occur ]

 * This is straightfoward to detect: the rootfs either can’t build, of
the installed system can’t boot. This could be detected before landing.

[ Other Info ]

 * I did a rootfs build in my ppa:
https://launchpad.net/~didrocks/+archive/ubuntu/ppa/+build/32740308 and
built a rootfs from it: https://launchpad.net/~ubuntu-wsl-
dev/+livefs/ubuntu/noble/wsl.

** Affects: livecd-rootfs (Ubuntu)
     Importance: Undecided
         Status: Fix Released

** Affects: livecd-rootfs (Ubuntu Noble)
     Importance: Undecided
         Status: New

** Also affects: livecd-rootfs (Ubuntu Noble)
   Importance: Undecided
       Status: New

** Changed in: livecd-rootfs (Ubuntu)
       Status: New => Fix Released

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https://bugs.launchpad.net/bugs/2147086

Title:
  [SRU] Fix noble image by dropping unused sb build

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

Bug description:
  [ Impact ]

    * The current noble image fails to build since we try to build a
  snap model for sb. This one used to be synced by the Cloud team which
  doesn’t need it anymore.

    * We moved our snaps to core24, which means that this now unused
  models would need to be updated, signed, and included in the new
  livecd-rootfs for every snaps transition. The goal is to minimize now
  the maintainance cost by avoiding doing this update and remove it for
  future transition, as this is not used at all anymore.

    * The impact is at ISO build time. The option from the installer
  using that model has never been available by our end user.

  [ Test Plan ]

   1. Start a noble image build
   2. Ensure the build is succesful
   3. Try to install this Ubuntu desktop image. Installation should be successful
   4. After rebooting on the installed system, the model "classic-model.model" should no be present on the system.

  
  [ Where problems could occur ]

   * This is straightfoward to detect: the rootfs either can’t build, of
  the installed system can’t boot. This could be detected before
  landing.

  [ Other Info ]

   * I did a rootfs build in my ppa:
  https://launchpad.net/~didrocks/+archive/ubuntu/ppa/+build/32740308
  and built a rootfs from it: https://launchpad.net/~ubuntu-wsl-
  dev/+livefs/ubuntu/noble/wsl.

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