sudo apt-get install python3.5
UPDATE Thanks to Don Kirkby who highlight that there is a new recommended PPA. The updated one is ppa:deadsnakes/ppa, so the complete command is the following: sudo add-apt-repository ppa:deadsnakes/ppa If you are using Ubuntu, you can install it adding a PPA; so you can proceed in this way: sudo add-apt-repository ppa:fkrull/deadsnakes sudo apt-get update sudo apt-get install python3.5 If this procedure doesn't work, is possible that your Ubuntu version not supported it. So i think that you can install in this way: sudo apt-get install libssl-dev openssl wget https://www.python.org/ftp/python/3.5.0/Python-3.5.0.tgz tar xzvf Python-3.5.0.tgz cd Python-3.5.0 ./configure make sudo make install
