My computer has a wireless network adapter inside, but at present it can't work. I guess it needs a driver program. At present, the adapter can neither work nor be shown in the system. I even cannot see the port number or the MAC address of the adapter. In another word, the adapter cannot be tested or sensed by the system. So how can I get a proper driver program? My computer's model is Lenovo ThinkPad L440. The wireless adapter is Intel branded and it is fixed on the motherboard. The system version is Xubuntu-14.04(64bit). If you can, please send me the driver program and teach me how to install. Thanks!