How to install a specific Python version on Ubuntu
$ sudo apt-add-repository multiverse
$ sudo apt-get install build-essential checkinstall
$ sudo apt-get install libreadline-gplv2-dev libncursesw5-dev libssl-dev libsqlite3-dev tk-dev libgdbm-dev libc6-dev libbz2-dev
$ cd ~/Downloads/
$ wget https://www.python.org/ftp/python/2.7.12/Python-2.7.12.tgz
$ tar -xvf Python-2.7.12.tgz
$ cd Python-2.7.12
$ ./configure
$ make
$ sudo checkinstall
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