NordVPN_DNS

Open the Terminal and type in:

su

You will be asked for your root password, please type it in and press enter

rm -r /etc/resolv.conf
nano /etc/resolv.conf

When the text editor opens, please type in these lines:

nameserver 103.86.96.100
nameserver 103.86.99.100

Now you have to close and save the file, you can do that by clicking Ctrl + X and pressing Y. Then please continue typing in the terminal:

chattr +i /etc/resolv.conf
reboot now

That is it. Your computer will reboot and everything should work correctly. If you will ever need to change your DNS addresses, please open the terminal and type in the following:

su

You will be asked for your root password, please type it in and press enter

chattr -i /etc/resolv.conf
nano /etc/resolv.conf

Change DNS addresses, save and close the file.

when DNS is not working and warning like
$ nordvpn c jp
Connecting to Japan #111 (jp111.nordvpn.com)
We're having trouble configuring Your DNS settings. If the issue persists, please contact our customer support.

reflesh resolver ( rm and nano )
nameserver 1.1.1.1
nameserver 1.0.0.1

or
$nordvpn set dns 103.86.96.100 103.86.99.100