A few days ago I had a heart-stopping moment on my main linux box running Ubuntu 12.04. I had just deleted two links from my desktop when suddenly I discovered that none of the remaining links on the desktop were working. Worse, clicking on any one of them them produced an error box saying the linked file no longer existed. I actually broke out in a sweat. All of these links are to files on a second internal hard disk where I keep my own data files, as opposed to the files for the OS and the various...