Can not find the Wireless adaptor in ubuntu 16.04 with Lenovo ideapad 320

Question

I can not find wireless adaptor in ubuntu 16.04

sudo lshw -C network

rfkill list

0: hci0: Bluetooth
    Soft blocked: no
    Hard blocked: no

I don't know what is going wrong, I have wasted 2 days already. So please help

Thanks
Sanjay