I need help getting a wifi adapter to work on Ubuntu 18.04

PC:

Lenovo Thinkcentre E73

Wifi Adapter(s):

Tp-link AC600 Archer T2U

Netgear Nighthawk AC1900 A7000

Router:

Netgear Nighthawk AC1900 R7000

Linux:

Kernel 4.15

Ubuntu 18.04