Ah, sorry my last comment was incomplete. There is a tool called ppa-
purge which installs the version of the package in the archive and
disables the PPAs.

I'm going to go ahead and close this as invalid.

** Changed in: ubuntu-release-upgrader (Ubuntu)
       Status: Incomplete => Invalid

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https://bugs.launchpad.net/bugs/1510536

Title:
  cannot upgrade

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