Does not recognize all connected webcams
Cheese only recognize only one webcam connected to ubuntu 18.01 kernel and not the other. However, another software does sense both cameras (the main computer webcam and a USB PS EYEToy). Cheese is an indicator that I can access the webcam through python in Blender 2.79. I can only access one camera in Blender and not the USB PS Eyetoy. Several years ago you could switch between the two.