Hmm, I'm not quite sure what did it, but reinstalling python2.4, python2.5 and bzrtools in that order (with apt-get install --reinstall <packagename>) made bzrtools install cleanly. I was still seeing this bug after reinstalling python2.5, but all was well again after doing bzrtools.
Hmm, I'm not quite sure what did it, but reinstalling python2.4, python2.5 and bzrtools in that order (with apt-get install --reinstall <packagename>) made bzrtools install cleanly. I was still seeing this bug after reinstalling python2.5, but all was well again after doing bzrtools.