Generally we don't need to install drivers. It might lack a free driver. You
can try installing the latest Linux-libre kernel to see if that supports it,
e.g. via http://jxself.org/linux-libre/
If that doesn't help, you could get a supported wifi, e.g. from
This device is listed in h-node as not working:
http://h-node.org/wifi/view/en/133/Ralink-corp--RT3090-Wireless-802-11n-1T-1R-PCIe
However, it was tested with Trisquel 5.5. Can you please test it with
Trisquel 6.0 (and use the latest Linux-libre as lembas suggested) and report
the results
