Edit:
My other machine also runs Arch, and the wireless is fine. It has a D-link DWA-566 card in it, uses the ath9k driver and it works great.
I just tried putting that old card into the new system and it's even slower than the other one,
I'm quite sure the linux-firmware package was already installed, so that wasn't the issue. I ended up switching to a usb dongle, but was seeing the same result; i.e. network speed was much slower than my other machines.
I'm not sure why this works, but likely something that gets blacklisted (or some other config) does the trick. Also, if you want to be more diligent, you can probably exclude anything not related to the network (e.g. there is a bunch of alsa and oss stuff in there that probably doesn't matter).
If the driver listed is not the right version or operating system, search our driver archive for the correct version. Enter D-Link DWA 582 Wireless AC1200 Dual Band PCI Express Adapter into the search box above and then submit. In the results, choose the best match for your PC and operating system.
Running Ubuntu 16.04, the WiFi adapter (a Dlink dwa-182 ac1200) is usually plug and play on Windows 10 (though it also has drivers) but since I switched to Ubuntu, it is not responding and I can't seem to be able to install the drivers.
After the commands are computed and completed, do "plug out - plug in" your Dlink DWA-182.Then check in the settings in wifi section and wait for a second tab to appear. Tabs can be seen in the image.
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