Software & AppsOperating SystemLinux

How To Connect Raspberry Pi 4 with Ubuntu Server to Wi-Fi

Ubuntu 10

In this tutorial, we’ll be discussing how to connect your Raspberry Pi 4, running Ubuntu Server, to a Wi-Fi network. This can be particularly useful when you’re setting up your Raspberry Pi without a screen or keyboard.

Quick Answer

To connect a Raspberry Pi 4 running Ubuntu Server to Wi-Fi, you can update the Netplan configuration file located at /etc/netplan/50-cloud-init.yaml with the SSID and password of your Wi-Fi network. After applying the changes and rebooting the Raspberry Pi, it should automatically connect to the specified Wi-Fi network.

Prerequisites

Before we start, ensure that you have the following:

  • A Raspberry Pi 4 running Ubuntu Server.
  • Access to the terminal of your Raspberry Pi, either directly or via SSH.
  • Your Wi-Fi network’s SSID and password.

Updating the Netplan Configuration

Ubuntu Server uses Netplan to manage network configurations. To connect to a Wi-Fi network, we’ll need to update the Netplan configuration file located at /etc/netplan/50-cloud-init.yaml.

Open the file using a text editor like nano:

sudo nano /etc/netplan/50-cloud-init.yaml

Add the following lines under the network section:

wifis:
 wlan0:
 optional: true
 access-points:
 "SSID-NAME":
 password: "WIFI-PASSWORD"
 dhcp4: true

In this configuration:

  • wifis is the section where we define our Wi-Fi configurations.
  • wlan0 is the name of the wireless network interface on the Raspberry Pi.
  • optional: true means that the boot process won’t wait for the Wi-Fi connection to be established.
  • access-points is where we define the Wi-Fi networks we want to connect to.
  • "SSID-NAME" and "WIFI-PASSWORD" are placeholders for your Wi-Fi network’s SSID and password. Replace them with your actual SSID and password.
  • dhcp4: true enables DHCP, which allows your Raspberry Pi to automatically obtain an IP address.

After updating the file, save and close it.

Applying the Changes

To apply the changes, run the following commands:

sudo netplan --debug try
sudo netplan --debug generate
sudo netplan --debug apply

The --debug flag is optional, but it can be useful for troubleshooting if the Wi-Fi connection doesn’t work.

The try command checks if the new configuration works, the generate command creates the necessary configuration files, and the apply command applies the new configuration.

Rebooting the Raspberry Pi

Finally, reboot your Raspberry Pi:

sudo reboot

After the Raspberry Pi reboots, it should automatically connect to the specified Wi-Fi network.

Troubleshooting

If you encounter any issues, you can check the system logs for any error messages related to the network interface or Netplan:

journalctl | grep wlan0
journalctl | grep netplan

These commands display any log entries that mention wlan0 or netplan, which can help you identify any issues with the Wi-Fi connection or the Netplan configuration.

Conclusion

In this tutorial, we’ve learned how to connect a Raspberry Pi 4 running Ubuntu Server to a Wi-Fi network by updating the Netplan configuration. This can be particularly useful when setting up a headless Raspberry Pi. If you encounter any issues, don’t hesitate to check the system logs or consult the Netplan documentation.

Can I connect my Raspberry Pi 4 to a Wi-Fi network without a screen or keyboard?

Yes, you can connect your Raspberry Pi 4 to a Wi-Fi network without a screen or keyboard by updating the Netplan configuration file.

How do I find the SSID and password of my Wi-Fi network?

You can usually find the SSID and password of your Wi-Fi network on the back or bottom of your Wi-Fi router. If it’s not there, you can check the settings of your router using a device that is already connected to the Wi-Fi network.

Can I connect my Raspberry Pi 4 to multiple Wi-Fi networks?

Yes, you can connect your Raspberry Pi 4 to multiple Wi-Fi networks by adding additional Wi-Fi configurations in the Netplan configuration file. Simply duplicate the wlan0 section and modify the SSID and password accordingly.

How do I know if my Raspberry Pi 4 is connected to Wi-Fi?

You can check if your Raspberry Pi 4 is connected to Wi-Fi by using the ip addr show wlan0 command. If you see an IP address assigned to the wlan0 interface, it means your Raspberry Pi is connected to Wi-Fi.

Can I connect my Raspberry Pi 4 to a hidden Wi-Fi network?

Yes, you can connect your Raspberry Pi 4 to a hidden Wi-Fi network by adding the hidden network’s SSID and password in the Netplan configuration file. Simply replace "SSID-NAME" with the actual SSID of the hidden network.

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