[Bug 1810499] [NEW] Provide a function to undo all upgrades of proposed packages

[Karl-Philipp Richter]

Public bug reported:

While packages which are upgraded by versions delivered by a PPA are
easy to downgrade with `ppa-purge` an equivalent function is missing for
packages installed from `proposed` after it has been activated. Afaik
the overview provided at https://askubuntu.com/questions/59443/how-can-i
-revert-back-from-an-upgrade-to-the-proposed-repository is still the
current state.

The switch to `proposed` can be an easy way to fix issues, however once
the fix makes it into an `-updates` repository it is a legitimate use
case to stop using `proposed` packages since they can be troublesome.

It'd be nice to automate the function provided by the scripts listed in
the askubuntu.com post in a maintained official Ubuntu software. Most of
the functionality is probably provided in `ppa-purge` already.

ProblemType: Bug
DistroRelease: Ubuntu 18.10
Package: software-properties-common 0.96.27
ProcVersionSignature: Ubuntu 4.18.0-13.14-generic 4.18.17
Uname: Linux 4.18.0-13-generic x86_64
ApportVersion: 2.20.10-0ubuntu13.1
Architecture: amd64
CurrentDesktop: ubuntu:GNOME
Date: Fri Jan  4 10:56:18 2019
InstallationDate: Installed on 2018-10-29 (66 days ago)
InstallationMedia: Ubuntu 18.10 "Cosmic Cuttlefish" - Release amd64 (20181017.3)
PackageArchitecture: all
ProcEnviron:
 LANG=de_DE.UTF-8
 SHELL=/bin/bash
 TERM=xterm-256color
 XDG_RUNTIME_DIR=<set>
 PATH=(custom, no user)
SourcePackage: software-properties
UpgradeStatus: No upgrade log present (probably fresh install)

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


** Tags: amd64 apport-bug cosmic

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https://bugs.launchpad.net/bugs/1810499

Title:
  Provide a function to undo all upgrades of proposed packages

Status in software-properties package in Ubuntu:
  New

Bug description:
  While packages which are upgraded by versions delivered by a PPA are
  easy to downgrade with `ppa-purge` an equivalent function is missing
  for packages installed from `proposed` after it has been activated.
  Afaik the overview provided at https://askubuntu.com/questions/59443
  /how-can-i-revert-back-from-an-upgrade-to-the-proposed-repository is
  still the current state.

  The switch to `proposed` can be an easy way to fix issues, however
  once the fix makes it into an `-updates` repository it is a legitimate
  use case to stop using `proposed` packages since they can be
  troublesome.

  It'd be nice to automate the function provided by the scripts listed
  in the askubuntu.com post in a maintained official Ubuntu software.
  Most of the functionality is probably provided in `ppa-purge` already.

  ProblemType: Bug
  DistroRelease: Ubuntu 18.10
  Package: software-properties-common 0.96.27
  ProcVersionSignature: Ubuntu 4.18.0-13.14-generic 4.18.17
  Uname: Linux 4.18.0-13-generic x86_64
  ApportVersion: 2.20.10-0ubuntu13.1
  Architecture: amd64
  CurrentDesktop: ubuntu:GNOME
  Date: Fri Jan  4 10:56:18 2019
  InstallationDate: Installed on 2018-10-29 (66 days ago)
  InstallationMedia: Ubuntu 18.10 "Cosmic Cuttlefish" - Release amd64 (20181017.3)
  PackageArchitecture: all
  ProcEnviron:
   LANG=de_DE.UTF-8
   SHELL=/bin/bash
   TERM=xterm-256color
   XDG_RUNTIME_DIR=<set>
   PATH=(custom, no user)
  SourcePackage: software-properties
  UpgradeStatus: No upgrade log present (probably fresh install)

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