ad-hoc configuration debug

?system log to check if ip address is settled

$ sudo vi /var/log/syslog

update linux version:

$ sudo apt-get install linux-image-generic-lts-quantal

check system version

$ sudo uname -a

check network card driver

$ sudo lshw -C network

restart wireless card driver

$ sudo service avahi-daemon restart

?>? find "ath"included driver

$ lsmod | grep ath

install "ath9k" driver

$ sudo modprobe ath9k

delete driver "ath9k

$ sudo modprobe -r ath9k