Could not calculate the upgrade

I'm getting the error message
"Could not calculate the upgrade

An unresolvable problem occurred while calculating the upgrade.

 This can be caused by:
 * Upgrading to a pre-release version of Ubuntu
 * Running the current pre-release version of Ubuntu
 * Unofficial software packages not provided by Ubuntu

If none of this applies, then please report this bug using the command 'ubuntu-bug ubuntu-release-upgrader-core' in a terminal."

So I fully agree with the general text in bug #934371, but I have no menas to say if they are identical

lsb_release -rd
Description: Ubuntu 13.10
Release: 13.10

uname -a
Linux 'hostname' 3.11.0-20-generic #35-Ubuntu SMP Fri May 2 21:31:50 UTC 2014 i686 i686 i686 GNU/Linux

ProblemType: Bug
DistroRelease: Ubuntu 13.10
Package: ubuntu-release-upgrader-core 1:0.205.6
ProcVersionSignature: Ubuntu 3.11.0-20.35-generic 3.11.10.6
Uname: Linux 3.11.0-20-generic i686
ApportVersion: 2.12.5-0ubuntu2.2
Architecture: i386
CrashDB: ubuntu
Date: Thu May 8 10:03:24 2014
InstallationDate: Installed on 2014-03-24 (44 days ago)
InstallationMedia: Ubuntu 13.10 "Saucy Salamander" - Release i386 (20131016.1)
MarkForUpload: True
PackageArchitecture: all
SourcePackage: ubuntu-release-upgrader
UpgradeStatus: Upgraded to saucy on 2014-05-08 (0 days ago)
VarLogDistupgradeTermlog: