After plugging in USB wifi adapter, check to see if the device is recognized. I used a Wavlink AC1300, because I had one on hand. It is not advertised as working with Linux but Armbian had no issue recognizing it. On the much cheaper side, some users have success with the RTL8188 chipset. I forgot about nmtui until after the fact.
dmesg ... [ 9718.525146] usb 5-1: new high-speed USB device number 5 using ehci-platform [ 9718.654242] usb 5-1: New USB device found, idVendor=0bda, idProduct=8812 [ 9718.654252] usb 5-1: New USB device strings: Mfr=1, Product=2, SerialNumber=3 [ 9718.654256] usb 5-1: Product: 802.11n NIC [ 9718.654260] usb 5-1: Manufacturer: Realtek [ 9718.654264] usb 5-1: SerialNumber: 123456
sudo nano /etc/network/interfaces
Updated file is:
auto lo iface lo inet loopback iface eth0 inet dhcp auto wlan0 allow-hotplug wlan0 iface wlan0 inet dhcp wpa-ssid "SSID" wpa-psk "PASSWORD"
sudo service networking reload sudo armbian-config
Configure Network to use wifi as default. To check up on on things try: