Just to test the extremes, I installed xubuntu-desktop and fluxbox, and they work (and can be selected at the login screen). So this is definitely a method to install an Ubuntu 14.04 LTS system with a non-pae kernel.
Of course 'text only' or a window manager (for example openbox or fluxbox) or an ultra-light desktop environment (Lubuntu or Lubuntu Core) will suit best for old computers that need a non-pae kernel. And a non-pae kernel is not a good idea with more than 2 GB RAM. But this system with a non-pae kernel works in a wide range of computers.
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