In my PC, Ubuntu 12.04 LTS, primarily the Cheese app, was unable to recognize the Logitech webcam attached. In Ubuntu Natty, Cheese worked without any fuss with the same webcam.
However, I found another app which recognizes the Logitech webcam without any problem and manipulation. The app is Guvcview, it captures photos and videos from the webcam and has a very high rating the Ubuntu Software