network settings for ubuntu 18.04 server with wifi and ethernet

01-network-manager-all.dhcp.yml

network:
  version: 2
  renderer: networkd
  ethernets:
    enp3s0:
      dhcp4: yes
      dhcp6: no
      optional: false

01-network-manager-all.static.yml

network:
  version: 2
  renderer: networkd
  ethernets:
    enp3s0:
      addresses: [192.168.88.50/24] # ip address static
      dhcp4: no # matikan dhcp4
      dhcp6: no
      gateway4: 192.168.88.1 # route gateway to modem                     
      nameservers:
        addresses: [8.8.8.8,8.8.4.4] # dns server
      optional: false

cront-netplay

sudo crontab -e
@reboot /usr/sbin/netplan apply

ubuntu-18-04-server.etc-netplan-default-router.yml

network:
  version: 2
  renderer: networkd
  wifis:
    wlp4s0:
      addresses: [192.168.1.80/24]
      dhcp4: no
      dhcp6: no
      gateway4: 192.168.1.1
      access-points:
        "C Y B E R":
          password: cyber1234
      nameservers:
        addresses: [8.8.8.8,8.8.4.4]
      optional: false
  ethernets:
    enp3s0:
      addresses: [192.168.1.50/24]
      dhcp4: no
      dhcp6: no
      gateway4: 192.168.1.1                      
      nameservers:
        addresses: [8.8.8.8,8.8.4.4]
      optional: true