I tried to follow T-1000 guide to install the driver for Archer T2U Plus dongle, although it worked, the dongle only sees and connects to 2.4GHz networks. I then did exactly the same but used this driver instead GitHub - nlkguy/archer-t2u-plus-linux: TP-Link Archer T2U Plus / AC600 High Gain USB Wifi Adapter Review & Driver installation Guide for various platforms. and everything is working correctly. No problems with 5GHz networks.