In this tutorial, we will see how to change your computer name (hostname) permanently under the following Ubuntu distros:

Ubuntu 14.10/14.04 or older
Linux Mint distros

Instructions

Open the terminal and run this command to know your current hostname:

hostname

To change it, edit this file first:

sudo gedit /etc/hostname

Change the hostname displayed to any name of your choice, save

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Source:upubuntu