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

[Damian Zaręba]

1. It was a fresh install, no upgrade :)
2. I was just simply trying to hack stuff around to build slightly customized image - remove 'standard' section from ubuntu-server for RPi 3/4, but I'm glad that it will be worked on.
3. Sure, it would be great.

BTW. I just would want to appreciate your patience and willingness to
help my poor soul :)

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

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

Status in Ubuntu Image:
  Fix Committed

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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