Crack your Wi-Fi WEP and WPA-PSK keys with Aircrack in Ubuntu

Aircrack-ng is an 802.11a/b/g WEP/WPA cracking program that can recover a 40-bit, 104-bit, 256-bit or 512-bit WEP key once enough encrypted packets havebeen gathered. Also it can attack WPA1/2 networks with some advanced methods or simply by brute force.

Howto Install Aircrack-ng in ubuntu

open a terminal and type

$sudo apt-get install aircrack-ng  

or use Synaptic package manager