both lidb5.1 & 5.3 are installed, and strangely 5.3 is set as removable (inside synaptic). Usually we use the latest version, not the previous one.
in fact that change comes from libpython2.7-stdlib:
python2.7 (2.7.4~rc1-2) experimental; urgency=low
* Backport webbrowser updates from 3.3. Closes: #700429.
* Build again using db-5.1 instead of db-5.3.
-- Matthias Klose <firstname.lastname@example.org> Sun, 24 Mar 2013 18:27:57 +0100