fatal error while release-upgrad

[karl]

The do-release-upgrade -d fails with

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dpkg: Fehler: Parsen der Datei »/var/lib/dpkg/status«, nahe Zeile 53055 Paket »libsdl-ttf2.0-0:i386«:
 gemischte zusammen installierbare und nicht zusammen installierbare Paketinstanzen vorhanden
Error in function:

A fatal error occurred

Please report this as a bug and include the files
/var/log/dist-upgrade/main.log and /var/log/dist-upgrade/apt.log in
your report. The upgrade has aborted.
Your original sources.list was saved in
/etc/apt/sources.list.distUpgrade.

SystemError: E:Sub-process /usr/bin/dpkg returned an error code (2)

Could not install the upgrades

The upgrade has aborted. Your system could be in an unusable state. A
recovery will run now (dpkg --configure -a).

dpkg: Fehler: Parsen der Datei »/var/lib/dpkg/status«, nahe Zeile 53055 Paket »libsdl-ttf2.0-0:i386«:
 gemischte zusammen installierbare und nicht zusammen installierbare Paketinstanzen vorhanden
dpkg-query: Fehler: Parsen der Datei »/var/lib/dpkg/status«, nahe Zeile 53055 Paket »libsdl-ttf2.0-0:i386«:
 gemischte zusammen installierbare und nicht zusammen installierbare Paketinstanzen vorhanden

Upgrade complete

The upgrade has completed but there were errors during the upgrade
process.

To continue please press [ENTER]
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ProblemType: Bug
DistroRelease: Ubuntu 12.10
Package: dpkg 1.16.7ubuntu3
ProcVersionSignature: Ubuntu 3.2.0-30.48-generic 3.2.27
Uname: Linux 3.2.0-30-generic x86_64
NonfreeKernelModules: nvidia
ApportVersion: 2.0.1-0ubuntu13
Architecture: amd64
Date: Mon Sep 17 18:42:07 2012
InstallationMedia: Ubuntu 11.10 "Oneiric Ocelot" - Release amd64 (20111012)
ProcEnviron:
 TERM=xterm
 PATH=(custom, no user)
 LANG=de_DE.UTF-8
 SHELL=/bin/bash
SourcePackage: dpkg
UpgradeStatus: Upgraded to quantal on 2012-09-17 (0 days ago)