How to change hostname in ubuntu

Changing the hostname or computer name in ubuntu

Edit /etc/hostname and change to the new value,

nano /etc/hostname
Edit /etc/hosts and change the old 127.0.1.1 line to your new hostname

127.0.0.1 localhost
127.0.1.1 ubuntu.local ubuntu # change to your new hostname

Now after a reboot, your hostname will be the new one you choose.