Not detecting WiFi adapter


We ordered this kit which comes with WiFi adapter including 2 antennas. I connected it, but Ubuntu does not see it.

lspci -nn | grep -i network does not show the WiFi controller, only ethernet ones. I tried downloading the latest firmware files but no help. Looking at dmesg | grep iwl does not show anything. It seems like it is not connected at all. I am using pre-installed Ubuntu with kernel 4.15.

Not sure if antennas are connected properly, but I guess it should still recognize it. What is the best way to check if everything is connected as it should be? Any inputs on what to try next?