Change computer name (Ubuntu)

Refer to https://askubuntu.com/questions/9540/how-do-i-change-the-computer-name

Step 1: Edit /etc/hostname
    # vim /etc/hostname
Step 2: Edit /etc/hosts
    # vim /etc/hosts
Step 3:
    # hostnamectl set-hostname 'new-hostnam'
Step 4: Restart Terminal