If I can't find john, aircrack-ng and nano what do I do?

Or in other words what am I doing wrong?

I entered the commands but it said the packages could not be found

[EDIT]
K i got them, just had to enable extras devel

Ok so I run faircrack then I select WPA and click scan, I find my home network which is WPA encrypted, I select it and press start "start injection capture" it opens up an Xterminal window, I connect my laptop to the network, it sees the MAC and starts doing it's work. Do I wait till the authenticate button becomes clickable? Or do I go straight to Decrypte, select both digits and letters bcuz I know my password contains such, and click decrypt? Also how long do I wait till I see a key?

[SOLVED]
Also why is it I after I run Faircrack I can no longer see WiFi networks unless I reboot my n900?

Is their a way to fix that issue

[FIX] Hit Disable "Monitor Mode and Disable "Injection"