It seems there is no official Linux driver for TP-Link T9E AC1900 fromTp-Link website. However, you can install Broadcom driver for this model. On Ubuntu 16.04, Open "Software & Updates", click "Additonal Drivers", and install BCM4360 driver.

Alternatively, you can install it by command line.

sudo apt-get install bcmwl-kernel-source

Previously, I used a USB wifi adpter and I found the speed is always far under the speed it should reach. After installing this device, the speed got doubled and met my expection!