AC1200 USB adapters are made by many brands (TP-Link, Linksys, EDUP, BrosTrend, Cudy, Ugreen, etc.), but they use a few common chipsets from Realtek or MediaTek.
Common AC1200 chipsets:
Why chipset matters: The driver depends on the chipset, not just the brand name. The same chipset works across brands. wifi 5 ac1200mbps wireless usb adapter driver
How to find your chipset:
The open-source ecosystem has caught up, but you must be diligent. AC1200 USB adapters are made by many brands
sudo apt update
sudo apt install git dkms build-essential
git clone https://github.com/morrownr/88x2bu.git
cd 88x2bu
sudo ./install-driver.sh
If your WiFi drops every few minutes: