dont forget about low-latency kernel. i'm using ubuntu studio that shipped with both pd and low-latency kernel

ok, i'd like to share my *happy* experience too : don't use deb package (the one that i've found was missing some files ), just download binaries and put it into ../pd/extra/

i have the same problem on linux (ubuntu 7.04)
i installed externals from deb packages (pd-zexy, pd-cyclone, etc) and all of them work fine, except cyclone.
tried -lib cyclone, -lib [full path to external]/cyclone, -lib maxmode.. pd just says "can't load library"...
maybe i need to build cyclone from source, but i cant find any instructions on this