Volume problems


I am a new user of the system and so far I have really enjoyed it and have been able to resolve the vast majority of problems with the forum and system manual.
However, I think my audio on the notebook is low. I can’t increase, decrease or mute the volume.

Something I can do?

I saw that in settings / audio the volume switch is not active.
and my shortcut keys for keyboard functions don’t work.

My Hw is notebook Lenovo B330-15IKBR- Intel i5 8º Gen - 8GB RAM