Comment 1 for bug 114930

I get the same.

I installed Trac which installed python-clearsilver. The offending shared lib is neo_cgi.so
You can see from locate neo_cgi.so that it is located
/usr/lib/python2.4/site-packages/neo_cgi.so
/usr/lib/python2.5/site-packages/neo_cgi.so
(or you could check in the properties of the package python-clearsilver in Synaptic or whichever)

A fix is to download the latest clearsilver sources from http://www.clearsilver.net/downloads/clearsilver-0.10.4.tar.gz

tar zxvf it, yadda yadda yadda and then configure it using ./configure --disable-wdb --disable-compression --disable-perl --with-python=$(which python)

(I disable wdb because I don't know what it is and I disable compression because it complains about not finding libz even though it is there - grrr -
dpkg-query -S /usr/lib/libz.so.1 gives zlib1g: /usr/lib/libz.so.1 and I disable perl because perl scares me)

then make and now there is a python directory, go into it and cp -i neo_cgi.so /usr/lib/python2.5/site-packages/neo_cgi.so to overwrite the 2.5 version which in Gutsy development is the latest python (I suppose you could build a 2.4 version because python2.4 -c 'import neo_cgi' gives the same errors as reported above but as trac uses 2.5 so meh...

I would attach the .so but it's 1/2 a meg :)
-rw-r--r-- 1 root root 496350 2007-06-09 15:25 /usr/lib/python2.5/site-packages/neo_cgi.so