Ubuntu系统，插了webcam

# apt install v4l-utils

# dmesg | tail

#v4l2-ctl  --list-devices

cannot open device /dev/video0,exiting

#v4l2-ctl  --all

cannot open device /dev/video0,exiting

#dmesg | grep -i camera -->returns nothing

#lsusb

#lspci

#lsmod

#lsmod| grep uvcvideo

# modprobe uvcvideo