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

 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.

[email protected]:~# cat /etc/lsb-release
DISTRIB_ID=Ubuntu
DISTRIB_RELEASE=20.04
DISTRIB_CODENAME=focal
DISTRIB_DESCRIPTION="Ubuntu 20.04.1 LTS"
[email protected]:~#

 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

[email protected]:~# 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/
[email protected]:~# 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

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