trytond crashed with ImportError in /usr/lib/python2.7/dist-packages/psycopg2/__init__.py: can't import mx.DateTime module

[steinhauser christian]

after boot

ProblemType: Crash
DistroRelease: Ubuntu 11.10
Package: tryton-server 2.0.1-1ubuntu1
ProcVersionSignature: Ubuntu 3.0.0-7.9-generic 3.0.0
Uname: Linux 3.0.0-7-generic x86_64
Architecture: amd64
Date: Wed Jul 27 00:09:32 2011
ExecutablePath: /usr/bin/trytond
InstallationMedia: Ubuntu 11.10 "Oneiric Ocelot" - Alpha amd64 (20110705.1)
InterpreterPath: /usr/bin/python2.7
PackageArchitecture: all
ProcCmdline: /usr/bin/python /usr/bin/trytond --config=/etc/trytond.conf --logfile=/var/log/tryton/trytond.log
ProcEnviron:
 PATH=(custom, no user)
 LANG=fr_FR.UTF-8
 SHELL=/bin/bash
PythonArgs: ['/usr/bin/trytond', '--config=/etc/trytond.conf', '--logfile=/var/log/tryton/trytond.log']
SourcePackage: tryton-server
Title: trytond crashed with ImportError in /usr/lib/python2.7/dist-packages/psycopg2/__init__.py: can't import mx.DateTime module
UpgradeStatus: No upgrade log present (probably fresh install)
UserGroups:

[yangoon (mathiasb)]

According to Dependencies.txt

python-egenix-mxdatetime 3.2.0-1
python-egenix-mxtools 3.2.0-1
python-genshi 0.6-1ubuntu2
python-lxml 2.3-0.1build1
python-minimal 2.7.2-4ubuntu3
python-pkg-resources 0.6.16-1
python-psycopg2 2.4.2-1

are installed, but probaly not properly (recompiled) for python2.7.

Anyway it is not an issue with trytond, but rather with python-psycopg2, if any.