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What do you mean with Ubuntu Linux, are you using the official Yocto image from Intel® Edison Board Download | Intel® Developer Zone or some other image?
There are several community post and instructions on how to connect a webcam to the mini breakout board. Take a look at Re: HowTo: connect USB camera and... and Connecting a USB device to the Edison Mini breakout board | Esther Jun Kim
Take a look atBasic tutorial 12: Streaming - GStreamer SDK documentation - GStreamer SDK documentation you may find it useful.