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in my Ubuntu desktop, I have face the same problem and fixed by the following steps... 1. plug in your usb camera to your computer 2. check whether you have installed any other camera apps like droidcam, etc on your system with the command " ls /dev/video* " without the double quotes.. if you see more than one video devices listed on the terminal then remove any unnecessary camera apps from your system with the command " sudo apt-get autoremove droidcam " assuming that you installed droidcam.. it may be any other camera app in your case... 3. check again your camera device by using the command " ls /dev/video* " without the double quotes.. if you steal see more than one video camera listed on the terminal repeat the procedure in step 2... until you see only one camera which you connected to your computer via usb port remains... this fixed my problem and i am happy to share it to those in the same boat with me.,, Remember: first of all plug in your usb web camera to your system...
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