Dell Inspiron 13 7000 2-in-1: Integrated webcam displays black stain on Ubuntu 20.04

Hello,

I bought the Delll Inspiron 13 7000 with Windows 10 over a year ago. But I had to install Ubuntu OS for work.

I don't used the integrated webcam until today and I've found that it displays a black stain on the top left of the screen.

What's the problem ? Is it because I've installed Ubuntu ? Do I have to install some driver ?

Thanks