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

[Timo Aaltonen]

Hello Philip, or anyone else affected,

Accepted livecd-rootfs into mantic-proposed. The package will build now
and be available at https://launchpad.net/ubuntu/+source/livecd-
rootfs/23.10.59 in a few hours, and then in the -proposed repository.

Please help us by testing this new package.  See
https://wiki.ubuntu.com/Testing/EnableProposed for documentation on how
to enable and use -proposed.  Your feedback will aid us getting this
update out to other Ubuntu users.

If this package fixes the bug for you, please add a comment to this bug,
mentioning the version of the package you tested, what testing has been
performed on the package and change the tag from verification-needed-
mantic to verification-done-mantic. If it does not fix the bug for you,
please add a comment stating that, and change the tag to verification-
failed-mantic. In either case, without details of your testing we will
not be able to proceed.

Further information regarding the verification process can be found at
https://wiki.ubuntu.com/QATeam/PerformingSRUVerification .  Thank you in
advance for helping!

N.B. The updated package will be released to -updates after the bug(s)
fixed by this package have been verified and the package has been in
-proposed for a minimum of 7 days.

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

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

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https://bugs.launchpad.net/bugs/2061121

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

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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