If you bought the Anewkodi 5.8Ghz/2.4Ghz USB wifi dongle because of his dual band functionality and his low price, you may recongnize that your Debian 9 (Stretch) is shipped wth no compatible driver by default. So sad. But there is one good hint hidden into the Amazon comments. M.W. wrote that the device on his Ubuntu works realy well and support us other linux fans with the specs:
the chipset used is „Realtek RTL8811AU Wireless LAN 802.11ac“
The following is snippet of dmesg from Linux:
[11256968.529081] usb 1-1.2: new high-speed USB device number 69 using ehci-pci
[11256968.622105] usb 1-1.2: New USB device found, idVendor=0bda, idProduct=a811
[11256968.622111] usb 1-1.2: New USB device strings: Mfr=1, Product=2, SerialNumber=3
[11256968.622114] usb 1-1.2: Product: 802.11ac WLAN Adapter
[11256968.622116] usb 1-1.2: Manufacturer: Realtek
[11256968.622118] usb 1-1.2: SerialNumber: 00e04c000001
Ok, we are one step further. On a short (a very short) list of search results on github we find this repo: https://github.com/gnab/rtl8812au
..and i try it:
- clone
- make
- plug it in (comands in the readme)
And *tadaa* it works quite well.
Thank you, you brave people on the internez!
RobTranquillo 
hello, I have Ubuntu 16 , when I am trying to run command ‚make‘
fatal_error: drv_types.h: No suck file or directory; compilation terminated
Hey Lucian, i’am sorry for that you have some trouble with my short manual. Did you carefully read the readme at the github repo? Maybe you want to file a issue at his repo?