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I am new to Ubuntu and I have been researching and doing practice but I couldn't figure out exactly the correct command to help me solve my problem. I would be very grateful if someone could help me out here. I want to know how I could use nano command to add the line "dns-servers" to the /etc/network/interfaces.

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You enter the command sudo nano /etc/network/interfaces.

The reason you have to prepend it with sudo is simply that the system configuration files is only writeable by root; not your everyday user.

When you've made the modifications you can exit nano by Ctrl+x. You'll be prompted if you want to save your changes. Press y to select Yes. When prompted for filename, simply press enter to save to same filename as you opened.

Nano in addition shows a list of useful keys at the bottom. As per Unix convention ^ is Ctrl, so ^-C is Ctrl+c, whilst M is Alt.

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nano is an text editor.

You can edit the file "/etc/network/interfaces"

with this command

nano /etc/network/interfaces

If you are not logged in as root, you need to type 'sudo' before.

sudo nano /etc/network/interfaces

You can save with CTRL+x - y and ENTER to confirm

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