I recently uninstalled Windows7 from my netbook and installed Ubuntu 13.04.
I am not able to connect to my wireless network. My netbook has an inbuilt Atheros wireless as well as an external Netgear G54/N150 wireless adapter. The inbuilt wireless adapter has never been working properly for a long time (even while using Windows). That is why I have been regularly using Netgear. My problem is, after installing Ubuntu, I am unable to connect to my wireless network through Netgear adapter.

I am very new to Ubuntu and Linux. Can you please help me in fixing this problem?

Thanks in advance.