Hi. Im new to Python and I need help upgrading the python version 2.6.5 to version 3.1.2. I'm running x64 Ubuntu. After I download and install the 3 version it does not overwrite or default itself as the new thing. I can't uninstall the 2 version because of dependencies on packages. I need the 3 version in order to follow the examples in my book on python. Please help.