[Bug 1602052] Re: ubuntu-release-upgrader should offer to actually purge PPA's

[zika]

Support for stop/pause and instruction to user how to purge given a list
of PPA's to be offered...

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https://bugs.launchpad.net/bugs/1602052

Title:
  ubuntu-release-upgrader should offer to actually purge PPA's

Status in ubuntu-release-upgrader package in Ubuntu:
  New

Bug description:
  We currently only disable PPA's prior to beginning a release upgrade
  and I wonder if it would be possible to actually purge the PPA's or at
  least list the PPA's and recommend (or demand) that the user purge all
  PPA's prior to performing the upgrade?

  I think it would be preferable to refuse to proceed with the upgrade
  than to have it fail once the process has begun, eh? I learned with a
  little help that the following command lists all PPA's in use:

  for PPA_FILE in $(ls /etc/apt/sources.list.d/*.list); do egrep -v
  '^#|^ *$' ${PPA_FILE} | grep "ppa.launchpad.net" | cut -d "/" -f4-5;
  done

  Then it's fairly easy to use ppa-purge to return the OS to a fairly
  out-of-box state package-wise. I don't know however what would happen
  with previously used PPA's that may have been disabled even though
  packages installed and/or upgraded via that PPA are still in use on
  the system.

  Maybe just a harsh warning would suffice if made prominent enough? I
  know we like to limit pop-ups but sometimes they're just needed.

  This should be considered a "wish list" bug, but I've thought about
  this for a while and bug #1600495 convinced me it was worth the
  electronic ink to mention it.

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