[Bug 1780028] Re: can't do-release-upgrade from Xenial to Artful

[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 package version numbers greater than the release to which
you are upgrading. You can revert the PPA by installing the ppa-purge
package from the official Ubuntu archive and then running 'sudo ppa-
purge oibaf'.  After that you try upgrading and again and if it still
fails open a new bug report.  Thanks and good luck!

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

** Tags added: ppa xorg-oibaf-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/1780028

Title:
  can't do-release-upgrade from Xenial to Artful

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

Bug description:
  trying to upgrade from Trusty 16.04.4 to Artful this is the end of the
  output (italian):

  AppStream cache update completed, but some metadata was ignored due to
  errors.

  Controllo gestore dei pacchetti
  Lettura elenco dei pacchetti... Fatto     
  Generazione albero delle dipendenze        
  Lettura informazioni sullo stato... Fatto 

  Calcolo delle modifiche

  Calcolo delle modifiche

  Impossibile calcolare l'avanzamento

  Si è verificato un problema irrisolvibile durante il calcolo 
  dell'avanzamento. 

  I motivi possono essere: 
  * L'avanzamento a una versione di pre-rilascio di Ubuntu 
  * L'esecuzione dell'attuale versione di pre-rilascio di Ubuntu 
  * Pacchetti software non ufficiali non forniti da Ubuntu 

  Se non vengono installati, segnalare il problema usando il comando 
  «ubuntu-bug ubuntu-release-upgrader-core» in un terminale. 

  
  Ripristino dello stato originale del sistema

  Interruzione

  ProblemType: Bug
  DistroRelease: Ubuntu 16.04
  Package: ubuntu-release-upgrader-core 1:16.04.25
  ProcVersionSignature: Ubuntu 4.4.0-128.154-generic 4.4.131
  Uname: Linux 4.4.0-128-generic x86_64
  NonfreeKernelModules: nvidia_uvm nvidia_drm nvidia_modeset nvidia
  ApportVersion: 2.20.1-0ubuntu2.18
  Architecture: amd64
  CrashDB: ubuntu
  CurrentDesktop: Unity
  Date: Wed Jul  4 08:36:42 2018
  InstallationDate: Installed on 2014-10-03 (1369 days ago)
  InstallationMedia: Ubuntu 14.04.1 LTS "Trusty Tahr" - Release amd64 (20140722.2)
  PackageArchitecture: all
  SourcePackage: ubuntu-release-upgrader
  UpgradeStatus: Upgraded to xenial on 2018-07-04 (0 days ago)
  mtime.conffile..etc.update-manager.release-upgrades: 2018-07-04T08:27:04.587815

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