In days past I built Pithos and then bastardized how it ran (from /usr/local/bin) .. this was before the latest versions of Pithos was released to Debian repos
A new dist-upgrade breaks the current VSIDO version of Pithos, to remedy it just run
First delete the file /usr/local/bin/pithos
Then run:
get pithos
or
sudo apt-get install pithos
Everything will work just as before...