Change Ubuntu 14.04 Into FullScreen Mode On Virtual Box

Ubuntu 14.04 Into FullScreen

The window size is controlled by the VM's screen resolution. If you manually resize the window on the host you'll only zoom on the image returned by the VM, so of course this gives a very bad image quality. Below are the steps to solve this.

1. Start your Ubuntu Virtualbox and login your root username and    password. Make sure that you have no mounted device in your
    CD/DVD    Devices.
     
2. Hit Right Ctrl in your keyboard, this will enable you to click on the    toolbars in your Virtualbox. Now go to Devices > Install Guest    Additions ... or you can just hit Right Ctrl + D. This will create an    image file (iso) and mount it automatically in your CD/DVD
    Devices.

Follow the Steps as shown and as instructed after installing guest additions. You might be prompted to type in your PASSWORD

3. Restart your Ubuntu Virtual Machine.

Your Ubuntu is now full screen in Virtualbox.