[Bug 1537943] Re: update-manager insists on updating from 14.04 to 15.04 when this is not possible. It fails every time. It should suggest 14.10 as the upgrade path.

[Brian Murray]

"The only possible upgrade path from 14.04 is via 14.10" - this is not
the case as the release upgrade process has been modified to skip over
releases that have reached an End of Life, like 14.10 has. That being
said there is currently a failure to calculate the upgrade from 14.04 to
15.04 as documented in bug 1534374.

The release upgrade process will not be modified to support upgrading to
End of Life releases as it is likely they have not received security
updates for critical issues.

** Changed in: ubuntu-release-upgrader (Ubuntu)
       Status: Confirmed => Won't Fix

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https://bugs.launchpad.net/bugs/1537943

Title:
  update-manager insists on updating from 14.04 to 15.04 when this is
  not possible. It fails every time. It should suggest 14.10 as the
  upgrade path.

Status in ubuntu-release-upgrader package in Ubuntu:
  Won't Fix

Bug description:
  I have summarized my problem in detail with screenshots here:

  http://askubuntu.com/questions/725547/i-am-recommended-to-upgrade-
  from-14-04-to-15-04-but-it-fails

  My ubuntu 14.04 amd64 continuously nags me about upgrading, but
  suggests an invalid upgrade path. The only possible upgrade path from
  14.04 is via 14.10 but it suggests the invalid 15.04 instead as the
  next release. Every time I start the upgrade it fails promtly and
  since I have found no option to override which release to upgrade to I
  am effectively stuck on 14.04.

  So work-around would be a way to tell update-manager that I want to
  spesifically upgrade to 14.10 but I don't know how this can be done.
  (or fixing the bug that causes it to think that 15.04 is the best
  release to upgrade to).

  I have done the following while trying to fix this:

  sudo dpkg --configure -a
  sudo aptitude update
  sudo aptitude upgrade
  sudo aptitude dist-upgrade
  sudo aptitude clean
  sudo aptitude purge update-manager
  sudo aptitude install  update-manager

  commented out all PPAs and old/legacy software sources

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: ubuntu-release-upgrader-core 1:0.220.8
  ProcVersionSignature: Ubuntu 3.13.0-76.120-generic 3.13.11-ckt30
  Uname: Linux 3.13.0-76-generic x86_64
  NonfreeKernelModules: nvidia
  ApportVersion: 2.14.1-0ubuntu3.19
  Architecture: amd64
  CrashDB: ubuntu
  CurrentDesktop: Unity
  Date: Tue Jan 26 00:09:55 2016
  InstallationDate: Installed on 2012-07-14 (1290 days ago)
  InstallationMedia: Ubuntu 12.04 LTS "Precise Pangolin" - Release amd64 (20120425)
  PackageArchitecture: all
  SourcePackage: ubuntu-release-upgrader
  Symptom: ubuntu-release-upgrader
  UpgradeStatus: Upgraded to trusty on 2014-10-08 (474 days ago)
  VarLogDistupgradeTermlog:
   
  mtime.conffile..etc.update.manager.release.upgrades: 2015-10-28T23:04:02.014699

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