Ubuntu is actually installed in a Virtualbox virtual machine on Mac OS X Yosemite 10.10 (10.10.2). Before proceeding read the important intro below from http://www.aircrack-ng.org/doku.php?id=cracking_wpa#introduction Install aircrack-ng suite. $ sudo apt-get install aircrack-ng It should install and provide the following. # dpkg -s aircrack-ng Package: aircrack-ng Status: install ok installed Priority: optional Section: net Installed-Size: 2167 Maintainer: Ubuntu Developers Architecture: amd64 Version: 1:1.1-6 Depends: libc6 (>= 2.15), libgcrypt11 (>= 1.4.5), libsqlite3-0 (>= 3.5.9), zlib1g (>= 1:1.1.4), wireless-tools, iw Recommends: wget Description: wireless WEP/WPA cracking utilities 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 have been gathered. Also it can attack WPA1/2 networks with some advanced ...