[Bug 2061175] Re: Handle (t64) package replacements

[Launchpad Bug Tracker]

** Merge proposal linked:
   https://code.launchpad.net/~enr0n/ubuntu-release-upgrader/+git/ubuntu-release-upgrader/+merge/464340

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https://bugs.launchpad.net/bugs/2061175

Title:
  Handle (t64) package replacements

Status in ubuntu-release-upgrader package in Ubuntu:
  Triaged
Status in ubuntu-release-upgrader source package in Noble:
  Triaged

Bug description:
  We should do something like:

  for package in cache:
    if package.is_installed and <candidate version is obsolete>:
       replacement = <find a package in the archive that Conflicts/Breaks + Replaces + Provides it>
       replacement.mark_install(auto_fix=False, auto_inst=False)
       replacement.mark_remove(auto_fix=False)

  To hint the solver to remove the installed pre-t64 packages and
  install packages replacing it. We gotta do some auto_fix, auto_inst
  False stuff as we do not want to resolve the dependencies at this
  point, let the upgrader work on this.

  I do not believe we have to protect our choice to remove the packages
  here like we did for gpg-wks-server as the packages are not updatable,
  but I can't say I've checked. Potentially maybe just the mark_install
  are enough since they will inevitably result in removals anyway, but
  this would be easier if the removal sticks around.

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