how to change dns server in ubuntu 18.04 code example

Example: add dns in ubuntu permanently

sudo apt update
sudo apt install resolvconf

sudo systemctl start resolvconf.service
sudo systemctl enable resolvconf.service
sudo systemctl status resolvconf.service

sudo vim /etc/resolvconf/resolv.conf.d/head
and add the following lines in it:
nameserver 8.8.8.8 
nameserver 8.8.4.4

sudo systemctl start resolvconf.service

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