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I guess you haven't install usb_cam rightly.

Please use sudo git clone https://github.com/bosch-ros-pkg/usb_cam.git in your workplace's src file.

Then catkin_make in your workplace.

you will find [100%] Built target usb_cam_node in the terminal.

add the workplace into your working place. Like source devel/setup.bash or other command.

finally, you can roslaunch usb_cam 'your_launch_name'.launch

I hope you can make it. :)