“I have a optical fiber internet internet + phone + TV connection. This USB Wifi Adapter for the Raspberry Pi doesn't work with 2019-07-10-raspbian-buster-full, whatever trick you may try, but it does perfectly with 2019-09-26-raspbian-buster-full, out of the box, no need of the driver CD included. (You can get these OS on https://www.raspberrypi.org/downloads/raspbian/). At the first boot with 2019-09-26-raspbian-buster-full, the raspberry dislays the nearby SSIDs and you've just to choose the right SSID and input the password of your internet connection device. If you look into the /etc folder, you can see that the wpa_supplicant.conf file has been entirely rewritten this way :
(The country=FR line must be twisted as to match your own country following the two-letter code https://en.wikipedia.org/wiki/ISO_3166-1_alpha-2#Officially_assigned_code_elements, for instance you should write country=DE if you live in Germany.)
I haven't noticed any other change in /etc.
So perhaps if you can't connect, you may alternatively try sudo nano /etc/wpa_supplicant/wpa_supplicant.conf, replace the whole text inside with ctrl_interface=DIR and so on down to }, type ctrl-X, y (for yes), return, and reboot the raspberry.”
“1. Plugged in ethernet.
2. ssh-ed into the pi.
3. Plugged in the WiFi adapter
4. Ran sudo raspi-config to configure the PI to use the WiFi adapter.
5. sudo reboot for good measure
6. Unplugged ethernet.
7. Confirmed, can ssh into PI over WiFi.”