installing a AC660 Archer T2U tp-link usb wireless

open a terminal alt-ctrl-t 

sudo apt install mokutil

lsusb; rfkill list; mokutil --sb-state

Bus 008 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 003 Device 006: ID 1058:0730 Western Digital Technologies, Inc. My Passport Essential (WDBACY)
Bus 003 Device 005: ID 0480:0901 Toshiba America Inc External USB 3.0
Bus 003 Device 004: ID 04e8:61b6 Samsung Electronics Co., Ltd M3 Portable Hard Drive 1TB
Bus 003 Device 002: ID 2357:011f TP-Link 802.11ac WLAN Adapter
Bus 003 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 010 Device 002: ID 0a12:0001 Cambridge Silicon Radio, Ltd Bluetooth Dongle (HCI mode)
Bus 010 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 009 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 007 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 006 Device 002: ID 045e:0745 Microsoft Corp. Nano Transceiver v1.0 for Bluetooth
Bus 006 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 005 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 004 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
0: phy0: Wireless LAN
    Soft blocked: no
    Hard blocked: no
1: hci0: Bluetooth
    Soft blocked: no
    Hard blocked: no
2: phy2: Wireless LAN
    Soft blocked: no
    Hard blocked: no
EFI variables are not supported on this system

sudo apt install git build-essential dkms
git clone https://github.com/aircrack-ng/rtl8812au.git
cd rtl8812au
sudo ./dkms-install.sh

(if doesn't work)

sudo apt-get install dkms

sudo make dkms_install

lsusb; rfkill list; mokutil --sb-state

(if doesn't work)

udo apt install git dkms

git clone https://github.com/aircrack-ng/rtl8812au.git

cd rtl8812au

sudo ./dkms-install.sh

sudo modprobe 88XXau 

please, see this site:

https://github.com/aircrack-ng/rtl8812au 

and this site

https://forums.linuxmint.com/viewtopic.php?t=307023

..