I'm trying to install the pd-extended-version 0.39 with the Hans installer. The install routine works well but i can't launch pd, I have :

"error while loading shared libraries: libjack-0.80.0.so.0: cannot open shared object file: No such file or directory"

I already have libjack0.100.0.so by default on my system. I don't how to solve this problem.

It ooks like this installer relies of a libjack version that is now obsolete in Ubuntu.
this installer is not a .deb package, it does not check for the dependencies.
You should install the package from your distro instead :
http://packages.ubuntulinux.org/edgy/sound/puredata
+http://packages.ubuntulinux.org/edgy/sound/pd-zexy
or grab the source and compile it for your system.