Looks like this is a problem/conflitct of python-mechanize with zope3:
$ dpkg -c zope3_3.4.0-0ubuntu2_amd64.deb |grep mechanize drwxr-xr-x root/root 0 2009-02-21 18:24 ./usr/lib/python2.5/site-packages/mechanize/ -rw-r--r-- root/root 1245 2009-01-30 05:27 ./usr/lib/python2.5/site-packages/mechanize/__init__.py ...
Looks like this is a problem/conflitct of python-mechanize with zope3:
$ dpkg -c zope3_3. 4.0-0ubuntu2_ amd64.deb |grep mechanize python2. 5/site- packages/ mechanize/ python2. 5/site- packages/ mechanize/ __init_ _.py
drwxr-xr-x root/root 0 2009-02-21 18:24 ./usr/lib/
-rw-r--r-- root/root 1245 2009-01-30 05:27 ./usr/lib/
...