ラズパイ4にUbuntu20.04.1を入れる

Raspberry Pi Imagerを使えばGUI上で簡単にSDにimageを入れることができます。
https://www.raspberrypi.org/downloads/

そのほか

全体の流れ
https://qiita.com/quailDegu/items/63114ba1e14416df8040

ネットワーク設定で参考にしたサイト
https://www.yokoweb.net/2018/05/09/ubuntu18-network-fix-ip-address/

その際に起きたエラー。lan serviceがうまく動いていないみたい。。。

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.

解決策

sudo systemctl start wpa_supplicant
shutdown now
sudo netplan generate
sudo netplan apply