Perhaps you should try installing kxstudio, it is a collection of packages and all the configuration stuff for tuning Ubuntu or Debian for audio work. I have never used it but many seem to swear by it and I believe it takes care of setting up and configuring any of the common synthesis DSLs like SC, pd and Csound. Perhaps someone else can fill in the massive gaps I left.

I'll have a look, maybe it'll help solve my problems!