How do I update virtualenv on Ubuntu?

I have installed virtualenv version 1.4.9 and the latest version is 1.6.1. How开发者_Python百科 do I update to version 1.6.1. Do I have to uninstall version 1.4.9? If so, how do I uninstall it?

Latest version is 1.6.1
use sudo pip install virtualenv it will upgrade incase you are using1.4.x version.
It advised to use pip over easy_install look here for the reasons

no, you don't. newer installed version of virtualenv automatics override older installed version.

if I remember currently, use this to install:

sudo easy_install virtualenv==1.6.1