[Bug 2036761] Re: [mantic] ppa-purge no longer purges what add-apt-repository adds

[Julian Andres Klode]

ppa-purge is a pretty dangerous script to run due to the downgrade
functionality that we should be discouraging use of.

It can create systems that look like they have supported components only
but had everything messed up by downgrading from some PPA.

If the PPA added packages not available in other sources, removing them
is fine. But if downgrades are involved it should come with reasonably
strong warnings.

Generally speaking people should probably reinstall from scratch if they
added a PPA that replaced important system packages.

** Also affects: software-properties (Ubuntu)
   Importance: Undecided
       Status: New

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https://bugs.launchpad.net/bugs/2036761

Title:
  [mantic] ppa-purge no longer purges what add-apt-repository adds

Status in ppa-purge package in Ubuntu:
  Triaged
Status in software-properties package in Ubuntu:
  New

Bug description:
  Test Case
  ---------
  From Ubuntu 23.10:

  sudo apt install hello
  sudo add-apt-repository ppa:jbicha/temp
  sudo apt upgrade

  apt policy hello

  sudo ppa-purge ppa:jbicha/temp

  apt policy hello
  reveals that the PPA version of hello is still installed

  Also /etc/apt/sources.list.d/jbicha-ubuntu-temp-mantic.sources
  is still present and active

  What Should Happen
  ------------------
  ppa-purge should disable the PPA and reinstall any PPA packages with the version apt currently sees.

  Background
  ----------
  add-apt-repository creates deb822 sources lists, starting in Ubuntu 23.10

  https://discourse.ubuntu.com/t/spec-apt-deb822-sources-by-
  default/29333

  Other Info
  ----------
  add-apt-repository has a --remove option

  But it does not do the reinstall part which is important
  Honestly, that feature is so important, I suggest that add-apt-repository take over the functionality of ppa-purge so that we always get the ppa-purge behavior

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