Comment 8 for bug 661654

This broke for me because /etc/update-motd.d/50-landscape-sysinfo which calls /usr/bin/landscape-sysinfo has an ImportError that is caught silently.

The ImportError is caused by a weird bug with python namespaces, which occurs because I have python-zope.cachedescriptors installed in addition to python-zope.interface.

https://bugs.launchpad.net/ubuntu/+source/zope.interface/+bug/688335

You can fix this error by removing /usr/lib/python2.7/dist-packages/zope/__init__.py