On Ubuntu 9.10, If we just download puredata autobuilds from: http://autobuild.puredata.info/auto-build/ ,  we could not install it on Ubuntu 9.10 just yet because there are these requirements: libmagick++10 and libmagick10, which are not in Ubuntu 9.10 repository.

My workaround: download both in .deb from the Ubuntu inteprid security repository:

http://packages.ubuntu.com/intrepid/i386/libmagick10/download
http://packages.ubuntu.com/intrepid/i386/libmagick++10/download

 Then, install libmagick10 first, then libmagick++10 ..

 Then.. Ta-da .. pd-extended from the autobuild is gonna be easy to install by just double-clicking on the desktop.