If I were you just add the extras-testing and extras-devel repositories. Use Fapman or Faster Application Manager too its way better than stock App Manager. You have to go to catagories in fapman and enable Advanced Catagories whatever they are called. Then you can search reaver, it is dependencie for the Aircrack GUI I think. Wifite.py works really good on an N900, thats just a python script though on google.