I have an old laptop with an Intel Celeron M 1.4 MHz non-PAE CPU, on which I had Ubuntu 12.04 for 4 or 5 years and now I wanted to switch to Lubuntu 14.04. I have installed the Lubuntu 14.04 desktop 32 bit version with the "forcepae -- forcepae" boot option. Everything went fine with the installation, but after restarting the laptop the GUI did not start. I have very little or almost 0 experience with command line, I have logged in with my user on command line and I have typed the "startx" command, but that did not help. I have attached a screenshot that might help you figure out what's going on.