Step 1 :
sudo apt-get install build-essential
sudo -sH
cd /opt
git clone git://git.code.sf.net/p/crunch-wordlist/code crunch
cd /opt/crunch
make
make install
rm -R /pentest
Step 2 :
To run it.
sudo -sH
cd /opt/crunch
./crunch
That's all! See you.