it seems that gconf2 and python are the issue, that jackd2 depends on gstreamer then the version you have depends on gconf and it depends on python but you do not have python.
did you upgrade to jessie from an earlier debian?
perhaps try to install python, then gconf2 before trying again with puredata.
perhaps look at gstreamer and see if it is possible to install it without gconf2, since gstreamer0.10-gconf:armhf is the one that depends on gconf2
perhaps try changing to jackd1, it may not have the same dependencies
Simon
PS
Debian have made a huge switch to using systemd, essentially shifting their attention to supporting the current standard desktop distributions ... yet somehow they managed to release jessie with a much shorter freeze than last time .... I certainly hope they have been as careful as in the past, especially regarding configurations outside that standard desktop distribution model.
I have used sid for many years, but stopped upgrading a while ago and have avoided moving to jessie so far since I often want to set up headless systems, or stand-alone devices that just start the minimal services required, and I have been very frustrated by recent distributions using the systemd, gconf etc ... with the new Debian it is going to get harder and harder to avoid the big, cumbersome gnome and systemd stuff as more and more packages get built depending on it.
I will probably install devuan, but for a while now most of my systems currently run what is now oldstable with the stuff I want recent versions of compiled locally.
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