Install a different python version then the one coming with your ubuntu version. We will be using the deadsnakes ppa to install the python versions.


First we need to add the deadsnakes PPA to your repositories:

sudo add-apt-repository ppa:fkrull/deadsnakes

After this you need to update your apt:

sudo apt-get update

Now you will be able install older python versions on Ubuntu 13.04 or newer versions on Ubuntu 10.04.


For example we will be installing Python 2.5 on Ubuntu 12.04:

sudo apt-get install python2.5