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When playing video and audio files, or on Youtube, there is not sound output.

Any solution?

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Try with installing the sound card driver:

sudo apt-get install build-essential linux-headers-`uname -r` alsa-base alsa-firmware-loaders alsa-oss alsa-source alsa-tools alsa-tools-gui alsa-utils alsamixergui

If already installed, then Reinstall the driver package:

 sudo apt-get --purge autoremove linux-headers-`uname -r` && sudo apt-get install linux-headers-`uname -r`
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The problem was causes by the Volume Control configuration. The wrong audio profile was selected.

To clarify:

In the System settings sound pane, on the output tab, I have multiple outputs. (Digital, and analogue and Headphones).

I had the wrong one selected, and changed it so it now works.

enter image description here

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