Search for Device Manager in your Avita Liber laptop.
Select System Devices.
Look for Intel(R) Smart Sound Technology (Intel(R) SST) Audio Controller right click on it and select Update Driver.
Now, you will be asked, "How do you want to search for drivers?"
Select the second option Browse my computer for driver software and select Next.
On the next screen, select "Let me pick from a list of available drivers on my computer."
Select High Definition Audio Controller and select Next.
If you followed the steps correctly, then this should solve the No Audio Output Device error.