[Bug 2061121] Re: Mantic preseeding of LXD using incorrect track/channel

[Philip Roche]

Verification done for Mantic now.

 * Successfully built image with LXD preseeded with these changes
 * confirmed LXD is preseeded/installed and works as expected.
 * Confirmed that preseeding other snap like google-cloud-cli for example in the GCE images continues to preseed as expected.

** Tags removed: verification-needed-mantic
** Tags added: verification-done-mantic

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

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Title:
  Mantic preseeding of LXD using incorrect track/channel

Status in livecd-rootfs package in Ubuntu:
  New
Status in livecd-rootfs source package in Mantic:
  Fix Committed
Status in livecd-rootfs source package in Oracular:
  New

Bug description:
  Recent Mantic cloud image builds fail - see
  https://launchpad.net/~cloudware/+livefs/ubuntu/mantic/cpc/+build/604087
  build log for an example.

  ```
  + UBUNTU_STORE_ARCH=amd64 SNAPPY_STORE_NO_CDN=1 snap download --cohort=MSAqIDE3MTI5MDgwNDcgNWIzNmM3MmIwYjVmNDIyMjQ5Y2NmY2JhNjA4MjAyNTliYzAyNjA4NWYzMjA1MWNlN2U3Y2Y3NjE5NzgwMmZkMQ== --channel=stable/ubuntu-23.10 lxd
  Fetching snap "lxd"
  store_download.go:142: no host system xdelta3 available to use deltas
  error: cannot download snap "lxd": no snap revision available as specified
  ```

  The was due to the default track now pointing to "5.21" instead of
  "latest". That change was made 20240411 which corresponds to when we
  started seeing failures.

  The long term solution is to preseed from "latest/" for all snaps and
  no longer assume that "latest/" is the default.

  [ Impact ]

  All image with preseeding of the LXD snap will fail

  [ Test Plan ]

   * Successfully build image with LXD preseeded with these changes
   * confirm LXD is preseeded/installed and works as expected.
   * Confirm that preseeding other snap like google-cloud-cli for example in the GCE images continues to preseed as expected.

  [ Where problems could occur ]

   * If other snaps are also preseeded they might not be preseeded as
  expected. This is covered in the test plan.

  [ Other Info ]

   * A temporary workaround has been made to point
  5.21/stable/ubuntu-23.10 to the 5.19 LXD snap but this will expire in
  one month.

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