Change permanent DNS in linux

sudo apt update

 sudo apt install resolvconf 

(confirm resolveconf is running)

 sudo systemctl status resolvconf.service 

(if resolveconf isn't running, enable then start it) 

sudo systemctl enable resolvconf.service

 sudo systemctl start resolvconf.service 

(check resolveconf status) 

sudo systemctl status resolvconf.service 

(edit the head file) 

sudo nano /etc/resolvconf/resolv.conf.d/head 

(enter your nameservers below the comments)

 nameserver 8.8.8.8 

nameserver 8.8.4.4 

(update resolve.conf file) 

sudo resolvconf --enable-updates

 sudo resolvconf -u 

(check if changes we successful) 

sudo nano /etc/resolv.conf