[Bug 1607973] Re: Upgrade from 15.10 to 16.04 LTS is not possible

[Launchpad Bug Tracker]

Status changed to 'Confirmed' because the bug affects multiple users.

** Changed in: ubuntu-release-upgrader (Ubuntu)
       Status: New => Confirmed

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https://bugs.launchpad.net/bugs/1607973

Title:
  Upgrade from 15.10 to 16.04 LTS is not possible

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

Bug description:
  when trying to upgrade to wily werewolf, I received the following error message:
  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

  I already uninstalled all packages I had installed, but still I
  receive this error message.

  Is there another way to upgrade to 16.04?

  ProblemType: Bug
  DistroRelease: Ubuntu 15.10
  Package: ubuntu-release-upgrader-core 1:15.10.14.4
  ProcVersionSignature: Ubuntu 4.2.0-42.49-generic 4.2.8-ckt12
  Uname: Linux 4.2.0-42-generic x86_64
  NonfreeKernelModules: nvidia
  ApportVersion: 2.19.1-0ubuntu5
  Architecture: amd64
  CrashDB: ubuntu
  CurrentDesktop: Unity
  Date: Sat Jul 30 00:12:08 2016
  InstallationDate: Installed on 2016-03-09 (142 days ago)
  InstallationMedia: Ubuntu 15.10 "Wily Werewolf" - Release amd64 (20151021)
  PackageArchitecture: all
  SourcePackage: ubuntu-release-upgrader
  UpgradeStatus: Upgraded to wily on 2016-07-29 (0 days ago)
  VarLogDistupgradeTermlog:

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