[Bug 1504432] [NEW] Unable to upgrade to a new release, even deactivating third party apt sources

[jcastp]

Public bug reported:

I try to upgrade from Ubuntu 15.04 to 15.10, but the updater is unable
to calculate the difference, and offers me three options. First and
second ones are not the case, as Im not "downgrading", and Im trying to
upgrade from 15.04 to 15.10. So, I deactivated the third party apt
sources, but the problem persists.

ProblemType: Bug
DistroRelease: Ubuntu 15.04
Package: ubuntu-release-upgrader-core 1:15.04.14.2
ProcVersionSignature: Ubuntu 3.19.0-30.34-generic 3.19.8-ckt6
Uname: Linux 3.19.0-30-generic x86_64
NonfreeKernelModules: fglrx
ApportVersion: 2.17.2-0ubuntu1.5
Architecture: amd64
CrashDB: ubuntu
Date: Fri Oct  9 09:53:24 2015
InstallationDate: Installed on 2014-07-28 (437 days ago)
InstallationMedia: Ubuntu 14.04.1 LTS "Trusty Tahr" - Release amd64 (20140722.2)
PackageArchitecture: all
ProcEnviron:
 LANGUAGE=en_US
 TERM=screen
 PATH=(custom, no user)
 LANG=es_ES.UTF-8
 SHELL=/bin/bash
SourcePackage: ubuntu-release-upgrader
UpgradeStatus: Upgraded to vivid on 2015-10-09 (0 days ago)
VarLogDistupgradeTermlog:

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


** Tags: amd64 apport-bug dist-upgrade third-party-packages vivid

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https://bugs.launchpad.net/bugs/1504432

Title:
  Unable to upgrade to a new release, even deactivating third party apt
  sources

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

Bug description:
  I try to upgrade from Ubuntu 15.04 to 15.10, but the updater is unable
  to calculate the difference, and offers me three options. First and
  second ones are not the case, as Im not "downgrading", and Im trying
  to upgrade from 15.04 to 15.10. So, I deactivated the third party apt
  sources, but the problem persists.

  ProblemType: Bug
  DistroRelease: Ubuntu 15.04
  Package: ubuntu-release-upgrader-core 1:15.04.14.2
  ProcVersionSignature: Ubuntu 3.19.0-30.34-generic 3.19.8-ckt6
  Uname: Linux 3.19.0-30-generic x86_64
  NonfreeKernelModules: fglrx
  ApportVersion: 2.17.2-0ubuntu1.5
  Architecture: amd64
  CrashDB: ubuntu
  Date: Fri Oct  9 09:53:24 2015
  InstallationDate: Installed on 2014-07-28 (437 days ago)
  InstallationMedia: Ubuntu 14.04.1 LTS "Trusty Tahr" - Release amd64 (20140722.2)
  PackageArchitecture: all
  ProcEnviron:
   LANGUAGE=en_US
   TERM=screen
   PATH=(custom, no user)
   LANG=es_ES.UTF-8
   SHELL=/bin/bash
  SourcePackage: ubuntu-release-upgrader
  UpgradeStatus: Upgraded to vivid on 2015-10-09 (0 days ago)
  VarLogDistupgradeTermlog:

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