Overall, I'm a noob.
I have problem with virtualbox. My main OS is Windows 10, I'm using Virtualbox 6.0.24, guest machine is Linux Ubuntu 18.04 LTS. I'm using my webcam as a microphone (and a webcam of course) and I have to "steal" it from main OS to virtual machine to use it on VM, I'd like to use it on both of them at the same time, like my headphones.
Obviously I installed guest additions after installing ubuntu and upgrading.
I fixed problem with my headphones being "hijacked", reinstalling guest worked.