I just installed stretch on my RPi 3 B+ running Raspbian Stretch. During installation it asked for my WiFi network info. However, it wouldn't accept it. I have it now working with a wired internet connection, but how do I now try to configure WiFi again?
Assuming that the problem is a mistyped SSID or passphrase, run
- Select 2 - Network Options to set the Wifi SSID and passphrase.
- While you at it, select 4 - Localization Options and confirm that your Wifi region is set correctly.
In addition, you might try this:
sudo iwlist wlan0 scan
Verify that your SSID (ESSID) is in the list.
There's a detailed how-to for wifi configuration at the Rpi/documentation website if you want to setup wifi from the command line. And finally, the if you're running "headless" you can now edit the
wpa-supplicant file in
/boot on the uSD card... actually, I'm pretty sure you can do this running "with head" :) also, but it's required for wifi access if you're headless.