[Bug 2064121] Re: Example provided in classic image definition doesn't build

[Paul Mars]

Hey Damian,

Thank you for reporting the bug. I confirm it appears we completely
forgot to keep this example up-to-date.

I will fix this. Meanwhile, feel free to look at
https://git.launchpad.net/ubuntu-images/tree/ to get working and up-to-
date examples to help you get started.

You can also read the current doc https://canonical-
subiquity.readthedocs-hosted.com/en/latest/reference/ubuntu-image.html

** Changed in: ubuntu-image
   Importance: Undecided => Low

** Changed in: ubuntu-image
     Assignee: (unassigned) => Paul Mars (upils)

** Changed in: ubuntu-image
       Status: New => In Progress

** Tags added: foundations-todo

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https://bugs.launchpad.net/bugs/2064121

Title:
  Example provided in classic image definition doesn't build

Status in Ubuntu Image:
  In Progress

Bug description:
  OS: Ubuntu Unity 24.04
  Ubuntu-image version: 3.4+snap1

  When using example provided under this link:
  https://github.com/canonical/ubuntu-
  image/blob/main/internal/imagedefinition/README.rst

  Image doesn't build at all.

  Error:

  ```yaml
  Error: yaml: unmarshal errors:
    line 8: cannot unmarshal !!map into string
  ```

  When editing this like from

  ```yaml
  kernel:
    name: linux-raspi
  ```

  to:
  ```yaml
  kernel: linux-raspi
  ```

  Then ubuntu-image returns following error:

  ```
  WARNING: rootfs.sources-list-deb822 was not set. Please explicitly set the format desired for sources list in your image definition.
  WARNING: rootfs.sources-list-deb822 is set to false. The deprecated format will be used to manage sources list. Please if possible adopt the new format.
  Error: Schema validation failed: [ModelAssertion: Does not match format 'uri']
  ```

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