Ubuntu HowTo: No audio on Lenovo Think Pad 11e with 20.04

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I have just installed Ubuntu 20.04 on a Think Pad 11e previously running Chrome OS. Everything seems to be running fine except for there is no audio from the speakers or head phones. I have tried the fixes mentioned here:

https://itsfoss.com/fix-sound-ubuntu-1304-quick-tip/

and I think I have done them correctly but as I am very new there is the possibility I have messed them up somehow. The output device is Dummy Audio (whatever that is?) and there is no option to change it. I would be extremely grateful for any help and advice you may be able to give.
EDIT: The audio is working through HDMI when I connect it to the TV

You should try installing private drivers in
Software & Updates.

Check this: https://itsfoss.com/install-additional-drivers-ubuntu/

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