When I try to upgrade Ubuntu 14.10 to 15.04 an error signal appear.

[Emanuele Sorce]

Because I'm Italian the error message tell:

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.

The error message appear when is on the second phases (Impostazione nuovi canali software) and the progress-bar is full and under there's write:"Calcolo delle modifiche".

The error appear me more than one time.

thanks for your work and intresting.

ProblemType: Bug
DistroRelease: Ubuntu 14.10
Package: ubuntu-release-upgrader-core 1:14.10.10
ProcVersionSignature: Ubuntu 3.16.0-44.59-generic 3.16.7-ckt14
Uname: Linux 3.16.0-44-generic i686
ApportVersion: 2.14.7-0ubuntu8.5
Architecture: i386
CrashDB: ubuntu
CurrentDesktop: Unity
Date: Mon Sep 21 17:07:13 2015
InstallationDate: Installed on 2015-01-08 (255 days ago)
InstallationMedia: Ubuntu 14.04.1 LTS "Trusty Tahr" - Release i386 (20140722.2)
PackageArchitecture: all
SourcePackage: ubuntu-release-upgrader
UpgradeStatus: Upgraded to utopic on 2015-09-21 (0 days ago)
VarLogDistupgradeTermlog:

[Brian Murray (brian-murray)]

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.

[Emanuele Sorce (tronfortytwo)]

thanks !!!! Thanks for your exelent work!!
Sorry for my useless bug segnalation.
thanks another time!

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Inviato dal mio dispositivo Ubuntu usando Dekko