[Bug 2012737] Re: config from .d/ is not loaded

[Ryan Hill]

I've seen the same behavior in 20.04, 22.04, and 22.10.

22.04 was where I initially ran into the issue.

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https://bugs.launchpad.net/bugs/2012737

Title:
  config from .d/ is not loaded

Status in ubuntu-release-upgrader package in Ubuntu:
  Incomplete
Status in update-manager package in Ubuntu:
  Incomplete

Bug description:
  When running do-release-upgrade, config items from the /etc/update-
  manager/release-upgrades.d/

  More specifically, they are loaded initially to determine ubuntu
  flavor, but only MetaPkgs are used.

  ```
    File "/usr/bin/do-release-upgrade", line 133, in <module>
      m = MetaReleaseCore(useDevelopmentRelease=options.devel_release,
    File "/usr/lib/python3/dist-packages/UpdateManager/Core/MetaRelease.py", line 104, in __init__
      self.flavor = get_ubuntu_flavor(cache=cache)
    File "/usr/lib/python3/dist-packages/UpdateManager/Core/utils.py", line 408, in get_ubuntu_flavor
      pkg = get_ubuntu_flavor_package(cache=cache)
    File "/usr/lib/python3/dist-packages/UpdateManager/Core/utils.py", line 428, in get_ubuntu_flavor_package
      meta_pkgs.extend(sorted(_load_meta_pkg_list()))
    File "/usr/lib/python3/dist-packages/UpdateManager/Core/utils.py", line 416, in _load_meta_pkg_list
      parser = DistUpgradeConfig('/usr/share/ubuntu-release-upgrader')
    File "/usr/lib/python3/dist-packages/DistUpgrade/DistUpgradeConfigParser.py", line 60, in __init__
  ```

  However the config is loaded a second time in Core/MetaRelease.py and
  only /etc/update-manager/release-upgrades is used for config so items
  such as Prompt overrides in the .d directory are not found.

  p.s. My initial goal was to override Prompt with Prompt=never under
  the .d directory

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