If you look in the Ubuntu repos for a package called gtk-recordmydesktop I believe that is popular for making screencasts. If you want to edit the video I thin

If you look in the Ubuntu repos for a package called gtk-recordmydesktop I believe that is popular for making screencasts. If you want to edit the video I think PiTiVi is installed by default. I hear OpenShot is also good for beginners.