AndyJLi0

cloud-init-local.service                                    loaded active exited  Cloud-init: Local Stage (pre-network)
  cloud-init-network.service                                  loaded active exited  Cloud-init: Network Stage
  systemd-network-generator.service                           loaded active exited  Generate network units from Kernel command line
  systemd-networkd-persistent-storage.service                 loaded active exited  Enable Persistent Storage in systemd-networkd
  systemd-networkd-wait-online.service                        loaded active exited  Wait for Network to be Configured
  systemd-networkd.service                                    loaded active running Network Configuration

AndyJLi0

admin@raspberrypi:/etc $ sudo systemctl restart systemd-networkd
admin@raspberrypi:/etc $ sudo systemctl start hostapd
Job for hostapd.service failed because the control process exited with error code.
See "systemctl status hostapd.service" and "journalctl -xeu hostapd.service" for details.
admin@raspberrypi:/etc $ journalctl -xeu hostapd.service
������ the configured Restart= setting for the unit.
Oct 18 20:30:15 raspberrypi systemd[1]: Starting hostapd.service - Access point and authentication server for Wi-Fi and Ethernet...
������ Subject: A start job for unit hostapd.service has begun execution
������ Defined-By: systemd
������ Support: https://www.debian.org/support