If you want

aircrack-ng

on Ubuntu 12.04 or its derivatives, you’re going to have to compile it. Ubuntu’s repository doesn’t contain

aircrack-ng

for 12.04, because it’s no longer maintained upstream at Debian.

Simple instructions:

sudo apt-get install build-essential libssl-dev
wget http://download.aircrack-ng.org/aircrack-ng-1.1.tar.gz
tar -zxvf aircrack-ng-1.1.tar.gz
cd aircrack-ng-1.1

Now open common.mak with an editor and find the following line:

CFLAGS ?= -g -W -Wall -Werror -O3

Remove

-Werror

:

CFLAGS ?= -g -W -Wall -O3

Save the file. Still in the folder

aircrack-ng-1.1

, run this:

make
sudo make install

When you run make, there’ll be a lot of stuff scrolling past, but that’s okay. It should still work.