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From Ask Ubuntu

To list all video devices picked up by the kernel

ls -ltrh /dev/video*

To list all devices attached to USB use lsusb ; to list all devices attached to PCI use lspci

Once you identify which device is your webcam, start the usb_cam_node node with

roslaunch usb_cam usb_cam-test.launch video_device:=<your-device>

where <your-device> is your webcam.

From Ask Ubuntu:

To list all video devices picked up by the kernel

ls -ltrh /dev/video*

To list all devices attached to USB use lsusb ; to list all devices attached to PCI use lspci

Once you identify which device is your webcam, start the usb_cam_node node with

roslaunch usb_cam usb_cam-test.launch video_device:=<your-device>

where <your-device> is your webcam.

From Ask Ubuntu:

To list all video devices picked up by the kernel

ls -ltrh /dev/video*

To list all devices attached to USB use lsusb ; to list all devices attached to PCI use lspci

Once you identify which device is your webcam, start the usb_cam_node node with

roslaunch usb_cam usb_cam-test.launch video_device:=<your-device>

where <your-device> is your webcam.

From Ask Ubuntu:

To list all video devices picked up by the kernel

ls -ltrh /dev/video*

Once you identify which device is your webcam, start the usb_cam_node node with

roslaunch usb_cam usb_cam-test.launch video_device:=<your-device>

where <your-device> is your webcam.

sudo usermod -a -G dialout $USER

From Ask Ubuntu:

To list all video devices picked up by the kernel

ls -ltrh /dev/video*

To list all devices attached to USB use lsusb ; to list all devices attached to PCI use lspci

Once you identify which device is your webcam, start the usb_cam_node node with

roslaunch usb_cam usb_cam-test.launch video_device:=<your-device>

where <your-device> is your webcam.

Edit:

Try adding yourself to the user group

sudo usermod -a -G dialout $USER

Now, I found this by some googling.