Cannot upgrade to saucy

[Kurt Huwig]

I've emptied my /etc/apt/sources.list.d/ and /etc/apt/sources.list is the orginal one. Still I cannot upgrade to saucy. I get this error message:

Änderungen werden berechnet ("calculating differences")

Änderungen werden berechnet

Es konnte nicht ermittelt werden, welche Systemaktualisierungen
verfügbar sind ("could not determine which system updates are available")

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

ProblemType: Bug
DistroRelease: Ubuntu 13.04
Package: ubuntu-release-upgrader-core 1:0.192.13
ProcVersionSignature: Ubuntu 3.8.0-31.46-generic 3.8.13.8
Uname: Linux 3.8.0-31-generic x86_64
ApportVersion: 2.9.2-0ubuntu8.3
Architecture: amd64
CrashDB: ubuntu
Date: Thu Oct 17 15:20:21 2013
InstallationDate: Installed on 2013-05-06 (164 days ago)
InstallationMedia: Ubuntu-Server 13.04 "Raring Ringtail" - Release amd64 (20130423.1)
MarkForUpload: True
PackageArchitecture: all
SourcePackage: ubuntu-release-upgrader
UpgradeStatus: Upgraded to raring on 2013-10-17 (0 days ago)

[Brian Murray (brian-murray)]

You seem to have installed the unity package although you are running a kubuntu system. This is preventing the upgrade from continuing as the release upgrader is refusing to remove the unity package.