在/etc/apt/source.list中加入下面三行：
deb http://all.repository.backtrack-linux.org revolution main microverse non-free testing
deb http://32.repository.backtrack-linux.org revolution main microverse non-free testing
deb http://source.repository.backtrack-linux.org revolution main microverse non-free testing
然后更新一下源：
$ sudo apt-get update
如果出现PGP错误之类的提示，执行下面代码：
$ sudo wget http://all.repository.backtrack-linux.org/backtrack.gpg
$ sudo sudo apt-key add backtrack.gpg
$ sudo sudo apt-key add backtrack.gpg
$ sudo apt-get update
开始安装：
$ sudo apt-get install gerix-wifi-cracker-ng
如果出现下面错误：
$ sudo apt-get install gerix-wifi-cracker-ng
Reading package lists... Done
Building dependency tree
Reading state information... Done
Some packages could not be installed. This may mean that you have
requested an impossible situation or if you are using the unstable
distribution that some required packages have not yet been created
or been moved out of Incoming.
The following information may help to resolve the situation:
The following packages have unmet dependencies:
gerix-wifi-cracker-ng : Depends: aircrack-ng but it is not going to be installed
E: Unable to correct problems, you have held broken packages.
这是依赖包没有安装的问题：
sudo apt-get install aptitude
sudo aptitude install gerix-wifi-cracker-ng
第1个问题的地方选n,第2个问题的地方选y。
安装完成。