Python 3.2 installation on Ubuntu 12.04
===

I am trying to install python 3.2.3 on my ubuntu machine, which is 12.04, but I do not want to disturb the current 2.7 installation. After searching on the internet, I found a reference [here][1]. I followed the instructions, but when trying to run 

`sudo apt-get install build-essential libncursesw5-dev libreadline5-dev libssl-dev libgdbm-dev libc6-dev libsqlite3-dev tk-dev`

I get an error saying that 

> E: Package 'libreadline5-dev' has no installation candidate.

What am I missing? Is there any other way to install python 3.2 on ubuntu? If I use `apt-get`, will it disturb the current installation?

  [1]: http://www.unixmen.com/howto-install-python-3-x-in-ubuntu-debian-fedora-centos/