[Bug 1535465] [NEW] Implement and support downgrade

[Teo]

Public bug reported:

Upgrading to 15.10 has been a catastrophe. Half an hour of use was
enough to find like a dozen of critical regressions making the system
unusable. Everything is broken, just look at my latest bug reports.

While you keep releasing major upgrades with so little testing and such
a low quality assurance, you should make downgrading  easy.

ProblemType: Bug
DistroRelease: Ubuntu 15.10
Package: ubuntu-release-upgrader-core 1:15.10.14.2
ProcVersionSignature: Ubuntu 4.2.0-23.28-generic 4.2.6
Uname: Linux 4.2.0-23-generic x86_64
NonfreeKernelModules: nvidia
ApportVersion: 2.19.1-0ubuntu5
Architecture: amd64
CrashDB: ubuntu
CurrentDesktop: Unity
Date: Mon Jan 18 23:06:50 2016
InstallationDate: Installed on 2013-10-11 (829 days ago)
InstallationMedia: Ubuntu 13.04 "Raring Ringtail" - Release amd64 (20130424)
PackageArchitecture: all
SourcePackage: ubuntu-release-upgrader
Symptom: dist-upgrade
UpgradeStatus: Upgraded to wily on 2016-01-18 (0 days ago)
VarLogDistupgradeTermlog:

** Affects: ubuntu-release-upgrader (Ubuntu)
     Importance: Undecided
         Status: Confirmed


** Tags: amd64 apport-bug dist-upgrade wily

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https://bugs.launchpad.net/bugs/1535465

Title:
  Implement and support downgrade

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

Bug description:
  Upgrading to 15.10 has been a catastrophe. Half an hour of use was
  enough to find like a dozen of critical regressions making the system
  unusable. Everything is broken, just look at my latest bug reports.

  While you keep releasing major upgrades with so little testing and
  such a low quality assurance, you should make downgrading  easy.

  ProblemType: Bug
  DistroRelease: Ubuntu 15.10
  Package: ubuntu-release-upgrader-core 1:15.10.14.2
  ProcVersionSignature: Ubuntu 4.2.0-23.28-generic 4.2.6
  Uname: Linux 4.2.0-23-generic x86_64
  NonfreeKernelModules: nvidia
  ApportVersion: 2.19.1-0ubuntu5
  Architecture: amd64
  CrashDB: ubuntu
  CurrentDesktop: Unity
  Date: Mon Jan 18 23:06:50 2016
  InstallationDate: Installed on 2013-10-11 (829 days ago)
  InstallationMedia: Ubuntu 13.04 "Raring Ringtail" - Release amd64 (20130424)
  PackageArchitecture: all
  SourcePackage: ubuntu-release-upgrader
  Symptom: dist-upgrade
  UpgradeStatus: Upgraded to wily on 2016-01-18 (0 days ago)
  VarLogDistupgradeTermlog:

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