Finally i've fixed the problem of incompatibility between python 2.5 and 2.6.
In order to get agm work under you ubuntu jaunty just download the script 'update_from_svn.sh' from the download page and launch it with sudo permissions.
it'll download and install the latest version of agm.
byebye.
Ps. I'd like to thank a lot Eemil Lagerspetz who helped me in this. Arigato!
