[Bug 1577006]

[Brian Murray]

*** This bug is a duplicate of bug 1069133 ***
    https://bugs.launchpad.net/bugs/1069133

Reviewing the files from your upgrade attempt you seem to have enabled a
PPA that provides Xorg packages. This will prevent the upgrade as that
PPA contains different versions of packages essential to Ubuntu.  The
page, https://launchpad.net/~xorg-edgers/+archive/ppa, contains details
on to how to revert to the official Xorg packages for the xorg-edgers
PPA.  Instructions for reverting to official Xorg packages should be
similar for the PPA that you have enabled.

** Tags added: ppa xorg-edgers-ppa

** This bug has been marked a duplicate of bug 1069133
   Get upgrade error 12.04 - 12.10 "Could not determine upgrade" - xorg from ppa

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https://bugs.launchpad.net/bugs/1577006

Title:
  Unable to upgrade Ubuntu to 16.04 version from 15.10

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

Bug description:
  System:
      Ubuntu 15.10 64 bits.
      Linux castarco-desktop 4.2.0-35-generic #40-Ubuntu SMP Tue Mar 15 22:15:45 UTC 2016 x86_64 x86_64 x86_64 GNU/Linux

  As an extra note, I'm using the privative Nvidia drivers provided by
  Ubuntu (not the ones provided by the NVIDIA webpage).

  The upgrade manager is telling me that it can't upgrade my system to
  Ubuntu 16.04, but it does not tell me what's the concrete problem,
  this is too vague (this is a Spanish message that appears after
  computing the needed changes):

      Eso se ha podido causar por: 
      * Actualizar a una versión de Ubuntu aún no publicada 
      * Estar ejecutando la versión actual, aún no publicada, de Ubuntu 
      * Paquetes no oficiales de software no proporcionados por Ubuntu 
      
      Si nada de esto aplica, informe de este error usando la orden 
      «ubuntu-bug ubuntu-release-upgrader-core» en una terminal.

  ProblemType: Bug
  DistroRelease: Ubuntu 15.10
  Package: ubuntu-release-upgrader-core 1:15.10.14.4
  ProcVersionSignature: Ubuntu 4.2.0-35.40-generic 4.2.8-ckt5
  Uname: Linux 4.2.0-35-generic x86_64
  NonfreeKernelModules: nvidia
  ApportVersion: 2.19.1-0ubuntu5
  Architecture: amd64
  CrashDB: ubuntu
  Date: Sat Apr 30 18:08:48 2016
  InstallationDate: Installed on 2015-09-03 (240 days ago)
  InstallationMedia: Ubuntu 15.04 "Vivid Vervet" - Release amd64 (20150422)
  PackageArchitecture: all
  ProcEnviron:
   LANGUAGE=es_ES
   TERM=xterm-256color
   PATH=(custom, no user)
   LANG=es_ES.UTF-8
   SHELL=/bin/bash
  SourcePackage: ubuntu-release-upgrader
  UpgradeStatus: Upgraded to wily on 2016-04-30 (0 days ago)

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