it's caused by python-msn due to python2.5->python2.6 try this dpkg-reconfigure python-msn to make python-msn (pymsn) identified by python2.6
it's caused by python-msn due to python2. 5->python2. 6
try this
dpkg-reconfigure python-msn to make python-msn (pymsn) identified by python2.6