I have a laptop - Jumper EZBOOK 3 PRO.
It has the wireless adapter - Intel® Dual Band Wireless-AC 3165.
I've installed Ubuntu 18.04.1 LTS and have a problem with super slow WiFi connection.
And there is no problem using Windows 10.
I found the fix - to disable 802.11n.
But this is not a good option, because I still will not have the maximum speed. I want to have 802.11n working fine.
P.S. I've tried to fix driver, but it wasn't successful. Also I've checked 802.11ac and it works fine.
P.S.S. I've booted Manjaro and have the same problem.