Updating my sound
With Ubuntu 14.04 and other Linux distributions, you have the choice to use open- or closed-source drivers for hardware that benefits from proprietary software.
Ubuntu automatically updates installed drivers and notifies you of proprietary upgrades, but you still need to know a little about your hardware to choose the best drivers.
In such a situation you need to set the HDMI audio device as the default. If you have an HDMI device, click button and hit OK.
If you're updating drivers because some of them don't work, you must try blacklisting the ones included with Ubuntu and loading others until your hardware starts working.
Click "Activate." The program downloads, installs and configures the proprietary drivers, and you must restart your computer to load them.
Simply logging out and logging back in doesn't load the new drivers.
Else you may have to uninstall the Driver (but DONT delete it) and then in the Device Manager Scan for hardware changes. Check your sound card Ensure that your Windows PC has a sound card or sound processor, and it’s working properly.
You will also observe that the default device shows a green a check beside it, labeled as Default if you have multiple devices.
So make sure your speakers are plugged into the line-out jack.