Cannot get microsoft lifecam vx-700 to work in Ubuntu

I cannot get my Microsoft LifeCam VX-700 to work in Ubuntu. My son bought if for me for Christmas so we can keep in touch while he is in US.

I get a green light on the webcam for a few seconds when I plug it in then it goes off, never to return. A mic plugged into the mic socket works fine. I have a basic understanding of computers so any suggestions in every day language would be welcome.

 My son installed Ubuntu before he went away and I do not know where to find anything, like device managers etc. now.

I am using an HP550 laptop.