[Bug 1614229] Re: Upgrade 14.04 -> 16.04 stops

[LaunchpadUser]

*** This bug is a duplicate of bug 1610756 ***
    https://bugs.launchpad.net/bugs/1610756

Same error here on 64 Bit Ubuntu 14.04 LTS

$ tail /var/log/dist-upgrade/main.log
2016-08-28 02:35:03,947 DEBUG running doUpdate() (showErrors=True)
2016-08-28 02:36:54,312 DEBUG openCache()
2016-08-28 02:36:54,313 DEBUG failed to SystemUnLock() (E:Nicht gesperrt) 
2016-08-28 02:37:00,894 DEBUG /openCache(), new cache size 83476
2016-08-28 02:37:00,894 DEBUG need_server_mode(): run in 'desktop' mode, (because of pkg 'ubuntu-desktop')
2016-08-28 02:37:15,051 ERROR Dist-upgrade failed: 'E:Fehler: Unterbrechungen durch pkgProblemResolver::Resolve hervorgerufen; dies könnte durch zurückgehaltene Pakete verursacht worden sein.'
2016-08-28 02:37:15,052 DEBUG abort called
2016-08-28 02:37:15,054 DEBUG openCache()
2016-08-28 02:37:20,982 DEBUG /openCache(), new cache size 74750
2016-08-28 02:37:20,983 DEBUG enabling apt cron job

but all "apt-get update", "apt-get upgrade", "apt-get clean" works and
the systems is up to date and not foreign package source is aktivated. I
even switched proprietary graphics drivers to X server default.

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https://bugs.launchpad.net/bugs/1614229

Title:
  Upgrade 14.04 -> 16.04 stops

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

Bug description:
  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
  NonfreeKernelModules: fglrx
  ApportVersion: 2.14.1-0ubuntu3.21
  Architecture: amd64
  CrashDB: ubuntu
  CurrentDesktop: Unity
  Date: Wed Aug 17 21:15:50 2016
  InstallationDate: Installed on 2012-03-28 (1603 days ago)
  InstallationMedia: Ubuntu 10.04.4 LTS "Lucid Lynx" - Release amd64 (20120214.2)
  PackageArchitecture: all
  SourcePackage: ubuntu-release-upgrader
  UpgradeStatus: Upgraded to trusty on 2016-08-17 (0 days ago)
  VarLogDistupgradeTermlog:

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