Install Ubuntu 20.04 on Raspberry Pi

Your Wifi might not working since the configuration for Wifi not done yet.

7. Get Wifi Working

$ ls /sys/class/neteth0  lo  wlan0

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

network:
    version: 2
    ethernets:
        eth0:
            dhcp4: true
            optional: true

network:
    version: 2
    ethernets:
        eth0:
            dhcp4: true
            optional: true
    wifis:
        wlan0:
            dhcp4: true
            dhcp6: false
            access-points:
                    "<your network ESSID>":
                     password: "<your WIFI Password>"

sudo netplan generate

And now apply this:

sudo netplan apply

If you are lucky, you should have network connected. Try to ping a website or run apt update command.

However, things may not go as smooth and you may see some errors. Try some extra steps if that’s the case.

Possible troubleshooting

It is possible that when you use the netplan apply command, you see an error in the output that reads something like this:

Failed to start netplan-wpa-wlan0.service: Unit netplan-wpa-wlan0.service not found.
Traceback (most recent call last):
  File "/usr/sbin/netplan", line 23, in <module>
    netplan.main()
  File "/usr/share/netplan/netplan/cli/core.py", line 50, in main
    self.run_command()
  File "/usr/share/netplan/netplan/cli/utils.py", line 179, in run_command
    self.func()
  File "/usr/share/netplan/netplan/cli/commands/apply.py", line 46, in run
    self.run_command()
  File "/usr/share/netplan/netplan/cli/utils.py", line 179, in run_command
    self.func()
  File "/usr/share/netplan/netplan/cli/commands/apply.py", line 173, in command_apply
    utils.systemctl_networkd('start', sync=sync, extra_services=netplan_wpa)
  File "/usr/share/netplan/netplan/cli/utils.py", line 86, in systemctl_networkd
    subprocess.check_call(command)
  File "/usr/lib/python3.8/subprocess.py", line 364, in check_call
    raise CalledProcessError(retcode, cmd)
subprocess.CalledProcessError: Command '['systemctl', 'start', '--no-block', 'systemd-networkd.service', 'netplan-wpa-wlan0.service']' returned non-zero exit status 5.

It is possible that wpa_supplicant service is not running. Run this command:

sudo systemctl start wpa_supplicant

Run netplan apply once again. If it fixes the issue well and good. Otherwise, shutdown your Ubuntu system using:

shutdown now

Start your Ubuntu system again, your wifi should be ok now. If not, just log in and generate and apply netplan once again:

sudo netplan generate
sudo netplan apply

References

• How to install Ubuntu Server on your Raspberry Pi
• netplan + WiFi: link is not ready (18.04 Server)