Maybe you should be more curious about unknown tweak: 'script' is a
generic word for a suite of codes; and ppa-purge refer indeed to each
installed ppa.

https://askubuntu.com/questions/307/how-can-ppas-be-removed

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

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https://bugs.launchpad.net/bugs/1769576

Title:
  not able to upgrade from ubuntu 16.04 to 18

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