I like ethernet over Wifi for my desktop.I dont like cable thats why i have wireless mouse and keyboard so i decide to test
a wifi dongle.My choice EDUP EP-AC1619.

⚬ Brand: EDUP
⚬ Model Number: EP-AC1619
⚬ Interface: USB
⚬ Wifi Band: Dual-Band(2.4G or 5.8G)
⚬ Transfer Rate: AC 600Mbps (2.4G 150M / 5.8G 433M)
⚬ Protocol Standard: IEEE 802.11n / IEEE 802.11b / IEEE 802.11g / IEEE 802.11 a / IEEE 802.11 ac
⚬ Chipset: RTL8812au
⚬ Color: White
⚬ Supported Systems: Win XP / VISTA / Win 7 / 8 / 8.1 / 10 / Mac / Linux

I have Mint 18.1 Kernel: 4.4.0-53-generic x86_64 i plug it but no luck.So terminal you know the drill in case you have git installed you dont need the 2 first commands.

sudo apt-get install build-essential git
git clone https://github.com/gnab/rtl8812au.git
cd rtl8812au
make
sudo make install
sudo modprobe 8812au

And ready to Rock´n´Roll.My ethernet give me around 98Mbps.I connect in 5GHz and run the speedtest.

For more detail i run wavemon.

Overall is a nice Wifi dongle and cost around 11$-15$ mine i bought it in bangood.com