I have a Dell Inspiron 531s desktop computer. I have installed Ubuntu 14.04.2 on it, but I can only install it from USB when I go to the "Install Ubuntu" option and not the "Try Ubuntu without installing" option because nothing will show up. When I boot up Ubuntu, I can log in, but after that, there is only the background and my mouse and nothing else. I have tried all kinds of things from other threads, but they have not worked. I have also tried installing nvidia-current and nvidia-current-updates to no avail. None of the commands from the mentioned thread works for me. Also, I can boot into recovery mode, but only if I don't have the Nvidia driver. And I haven't been able to do a normal boot at all.