No audio

Hello,

After an update and reboot, no audio comes out of my laptop anymore. I followed instructions of sound troubleshooting in help assistance and it seems my laptop doesn't recognize the sound card inside and is driverless (even when it has sounds modules installed).

I have no idea what happened, before updating and rebooting, sound was fine and functional. I've tried some solutions found on internet, but no succeed. I use Ubuntu 14.04LTS

Here are some hardware specifications:

00:1f.3 Audio device [0403]: Intel Corporation Device [8086:9d70] (rev 21)
Subsystem: Dell Device [1028:06b2]

If you need more information, please let me know... I'm a new Linux user and totally clueless (but want to learn more).

Thanks for reading,
Alejandra.-

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No audio