How to know your Ubuntu release version

How to know your Ubuntu Linux release version?

Its easy. Follow these steps:

1. Open your terminal
2. Login as root
3. Type cat /etc/issue.net

Its will display your version something like this:
Ubuntu 7.04

OR
go to your desktop, system->about ubuntu->version and release numbers

OR
lsb_release -a

It's will display like this:
No LSB modules are available.
Distributor ID: Ubuntu
Description: Ubuntu 7.04
Release: 7.04
Codename: feisty

Thats all.