[Bug 1608198] Re: upgrade 14.04 LTS to 16.04.1 LTS impossible

[Wolfgang Fahl]

See https://bugs.launchpad.net/ubuntu/+source/ubuntu-release-
upgrader/+bug/1486162. The bug is in the message that doesnot give any
hints on how to resolve this. E.g. looking in /var/log/dist-upgrade log
files or using ppa-purge see http://askubuntu.com/questions/307/how-can-
ppas-be-removed

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https://bugs.launchpad.net/bugs/1608198

Title:
  upgrade 14.04 LTS to 16.04.1 LTS impossible

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

Bug description:
  System offers to install 16.04.1 LTS over 14.04. After several minutes
  the message "unsolvable problem" appears

  Es konnte nicht ermittelt werden, welche Systemaktualisierungen
  verfügbar sind

  Ein unlösbares Problem trat beim Ermitteln der Systemaktualisierung
  auf.

   Dies kann verursacht worden sein durch:
   * Aktualisieren auf eine Vorabversion von Ubuntu
   * Verwendung der aktuellen Vorabversion von Ubuntu
   * Inoffizielle Softwarepakete, die nicht von Ubuntu bereitgestellt wurden

  Falls nichts von dem zutrifft, melden Sie diesen Fehler bitte, indem
  Sie den Befehl »ubuntu-bug ubuntu-release-upgrader-core« in einem
  Terminal ausführen.

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: ubuntu-release-upgrader-core 1:0.220.8
  ProcVersionSignature: Ubuntu 3.13.0-93.140-generic 3.13.11-ckt39
  Uname: Linux 3.13.0-93-generic x86_64
  ApportVersion: 2.14.1-0ubuntu3.21
  Architecture: amd64
  CrashDB: ubuntu
  CurrentDesktop: GNOME
  Date: Sun Jul 31 17:25:24 2016
  InstallationDate: Installed on 2013-10-08 (1026 days ago)
  InstallationMedia: Ubuntu 13.04 "Raring Ringtail" - Release amd64 (20130424)
  PackageArchitecture: all
  SourcePackage: ubuntu-release-upgrader
  UpgradeStatus: Upgraded to trusty on 2016-07-31 (0 days ago)
  VarLogDistupgradeTermlog:

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