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.