Say 'YES' to all questions. Then::
- $ apt-get install -t lenny-backports vim subversion python python-setuptools python-xml python-mutagen \
+ $ sudo aptitude install -t lenny-backports vim subversion python python-setuptools python-xml python-mutagen \
python-imaging python-numpy python-gst0.10 gstreamer0.10-plugins-base \
gstreamer0.10-fluendo-mp3 gstreamer0.10-plugins-good gstreamer0.10-plugins-bad