Change Ubuntu Server DNS Config

resolve.conf : 
sudo nano /etc/resolv.conf
	nameserver 8.8.8.8
	nameserver 8.8.4.4

netplan : 
sudo nano /etc/netplan/01-network-manager-all.yaml

network:
  version: 2
  renderer: networkd
  ethernets:
    enp0s3:
      dhcp4: no
      addresses: [192.168.157.140/24]
      gateway4: 192.168.157.140
      nameservers:
        addresses: [ 8.8.8.8 , 8.8.4.4 ]

sudo netplan apply


Verify the DNS Nameservers : 
	sudo resolvectl status


resolvectl dns eth0 8.8.8.8 8.8.4.4
resolvectl domain eth0 my.domain.com

(FOR TEST) : resolvectl