When typing in Ubuntu my cursor jumps around and its not application specific. It doesn't matter or Im filing in a web form, writing an e-mail or using LibreOffice or Lyx. Im using a Sony Vaio 64bit machine.
I read a previous question (link below) on this subject which indicates it may have something to do with the touchpad settings. As this has occurred in previous Ubuntu distros Im guess it is somekind of hardware issue.