Linux Mastering Development Ubuntu

sound input not found ubuntu 20.04

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I tested with my dell vostro 5000 series inbuilt sound in bios diagnosis and there was no hardware problem. Then i try on Ubuntu 20.04 broswer play video but no sound, test speaker no sound, then try earphone there was still no sound then tried external speaker using usb cable still no sound.
but in all of them ubuntu still not detected input device as shown in the picture , there is dropdown.It is disabled.

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