Rasberry Pi 4 can't connect to WiFi ubuntu server [fixed]

Introduction

In this tutorial, How to connect to WiFi ubuntu server on Rasberry Pi  4. Today, I buy Rasberry PI 4 new and install ubuntu 20.04 LTS.

root@ubuntu:~# cat /etc/lsb-release
DISTRIB_ID=Ubuntu
DISTRIB_RELEASE=20.04
DISTRIB_CODENAME=focal
DISTRIB_DESCRIPTION="Ubuntu 20.04.1 LTS"
root@ubuntu:~#

 after finish, Rasberry Pi 4 no identify ip address of wilfi. :D. 

Rasberry Pi 4 can't connect to WiFi ubuntu server [fixed]

The first, check network interface your system.

ll -la /sys/class/net/

Create new file config for wifi " /etc/netplan/wlan.yaml"

apply configure and reboot

netplan apply

The result, as below

root@ubuntu:~# ll -la /sys/class/net/
total 0
drwxr-xr-x  2 root root 0 Jan  1  1970 ./
drwxr-xr-x 74 root root 0 Jan  1  1970 ../
lrwxrwxrwx  1 root root 0 Jan  1  1970 eth0 -> ../../devices/platform/scb/fd580000.ethernet/net/eth0/
lrwxrwxrwx  1 root root 0 Jan  1  1970 lo -> ../../devices/virtual/net/lo/
lrwxrwxrwx  1 root root 0 Apr  1  2020 wlan0 -> ../../devices/platform/soc/fe300000.mmcnr/mmc_host/mmc1/mmc1:0001/mmc1:0001:1/net/wlan0/
root@ubuntu:~# cat /etc/netplan/wlan.yaml
# This file is generated from information provided by the datasource.  Changes
# to it will not persist across an instance reboot.  To disable cloud-init's
# network configuration capabilities, write a file
# /etc/cloud/cloud.cfg.d/99-disable-network-config.cfg with the following:
# network: {config: disabled}
network:
    version: 2
    renderer: networkd
    wifis:
            wlan0:
                    dhcp4: no
                    dhcp6: no
                    addresses: [192.168.1.113/24]
                    gateway4: 192.168.1.1

                    nameservers:
                            addresses: [192.168.1.1, 8.8.8.8]
                    access-points:
                            "SSID name":
                                    password: "xxx password of SSID"

Reboot your rasberry PI 4 with reboot command

reboot

You have fixed Rasberry Pi 4 can connect to wifi on Ubuntu 20.04

Conclusion

Troubleshooting WiFi connectivity issues on the Raspberry Pi 4 involves a series of methodical steps to identify and resolve potential problems. By ensuring your hardware is set up correctly, verifying network configurations, keeping your software up to date, and examining system logs for errors, you can effectively diagnose and fix most connectivity issues. If the built-in WiFi adapter continues to cause problems, using an external WiFi dongle can be a practical solution. With these troubleshooting steps, you can restore your Raspberry Pi 4’s connection to WiFi, allowing you to focus on your projects without interruption. Thank you for reading the huuphan.com page!

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