Ubuntu Server Raspberry Pi 3 Wifi

I was trying to get the WIFI working on my Raspberry PI 3 with Ubuntu Server 18.04 LTS, after some time researching I found a way to get it right:

First, we need to update everything just because. Don’t ask.

sudo apt update
sudo apt full-upgrade

We are going to use “net-plan” so we must run the following commands:

cd /etc/netplan/
sudo cp 50-cloud-init.yaml 50-cloud-init.yaml.bak
sudo nano 50-cloud-init.yaml

Now that we have edit the file, we are going to add the following at the bottom:

    wifis:
        wlan0:
            optional: true
            access-points:
                "ssid-here":
                    password: "password-here"
            dhcp4: true

You can test the configuration by executing:

sudo netplan --debug try
sudo netplan --debug generate # This one is going to give you more information about the issue, if there any.

If there is no issue in the output, then apply the configuration

sudo netplan --debug apply

Now, please reboot the Raspberry Pi 3 and it should boot connecting to the WIFI.