It seem default driver wont work with the Interpid Ibex even tons of manual have been referred via internet.
Bored with the driver so i try to install the driver manually myself.

First step is to disable the driver from ubuntu installation. System>Administration>Hardware drivers. Restart

Download the driver from here:

http://wireless.kernel.org/en/users/Download

extract the driver.

using console, enter to directory and type

make

then type

sudo make install

then type

sudo make unload

to unload any driver from ubuntu instalation. Then type

sudo make load

After that you can see a list of module loaded. To try the driver, type

modprobe ath5k
sudo ip link set wlan0 up
sudo iwconfig wlan0 essid any

Typing

iwconfig

will give output like this:

[email protected]:~$ iwconfig
lo        no wireless extensions.

eth0      no wireless extensions.

wmaster0  no wireless extensions.

wlan0     IEEE 802.11bg  ESSID:””
Mode:Managed  Frequency:2.412 GHz  Access Point: 06:13:92:0A:8F:63
Bit Rate=1 Mb/s   Tx-Power=20 dBm
Retry min limit:7   RTS thr:off   Fragment thr=2352 B
Power Management:off
Link Quality=100/100  Signal level:-51 dBm  Noise level=-102 dBm
Rx invalid nwid:0  Rx invalid crypt:0  Rx invalid frag:0
Tx excessive retries:0  Invalid misc:0   Missed beacon:0

Your wireless should be ready to connect.

Put

ath5k

inside /etc/modules to start the module on start up. Then you are ready to connect to internet..