[Bug 2063203] Re: Build ubuntu-core-desktop images

[Steve Langasek]

Because this is an entirely new image type that we are not currently
building, the risk of regression for this image type in particular is
effectively nil; and there are other changes included in this SRU that
are time-sensitive; so regardless of what the bug description says, I am
not going to hold up the SRU for this.

-       LB_UBUNTU_IMAGE_CHANNEL="${LB_UBUNTU_IMAGE_CHANNEL:-candidate}"
+       LB_UBUNTU_IMAGE_CHANNEL="${LB_UBUNTU_IMAGE_CHANNEL:-stable}"

Well that is a change that is entirely appropriate, and entirely
undocumented in the changelog!

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https://bugs.launchpad.net/bugs/2063203

Title:
  Build ubuntu-core-desktop images

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

Bug description:
  [Impact]

  We want to be able to build iso installer images that would install
  Ubuntu Core Desktop to target device. This is a completely new image
  and product, but it's important to get building as early as possible.

  The first core series that we want to support here is 24. However, due
  to issues with the ubuntu-core-desktop installer snap, the snap does
  not work on noble (which would be the best place to build the images
  from). However, since Ubuntu Core Desktop is a separate entity outside
  of the archive, it actually does not matter which Ubuntu series the
  'installer' part is. We can install Ubuntu Core Desktop 24 with no
  problems from a mantic installer.

  And this is what we want to do: backport the ubuntu-core-desktop build
  changes to mantic and, for now, use it for building the mantic images.
  We can switch to noble once noble works with the snap again.

  [Test Case]

  Run an image build on cdimage of ubuntu-core-desktop and see that the
  image builds and boots into the installer.

  [Regression Potential]

  Since some code-paths needed to be changes, there is a very low risk
  of other ubuntu-image based builds failing. So a re-check of all
  ubuntu-image based images would be recommended.

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