WARNING: CAUTION FORCING PAE ON PENTIUM M
I have been trying out installing Kubuntu 14.04 on my old HP Compaq nx5000 laptop, with a 1.5GHz pentium m, using forcepae to get the live USB to boot. It did (as did a Mint 17 mate live USB), and I successfully installed Kubuntu 14.04. and it seemed to be running normally.
However, It would not complete the installation of a large update (the one listing lots of software), seeming to fail on upgrading the kernal. On reboot, it came up again, but took much longer to reach the full desktop screen, and the touchpad mouse no longer works (movement or buttons). Fortunately, plugging in a normal USB mouse does work.
System info says kernal is 3.13.0-24-generic (not -29). Input Devices - Touchpad has a note that "Synaptic driver is not installed (or is not used)", and Desktop Effects - Advanced now shows Compositing type as XRender ( initially Open GL 2) and Qt Graphics system as Native (previously something else with Qt4 in it I think). I will explore further, but wanted to warn of possible "kernal taint" in trying forcepae, as noted in LM preboot warning.
Also found this interesting: https://help.ubuntu.com/community/EnablingPAE