phillw has compiled a non-pae kernel for Trusty, and has built an iso file with an alternate installer around it. He is asking for help now, help to test it in a computer with a real non-pae CPU. It would be very valuable for the Lubuntu project, if you can spend some time testing it.
The iso file can be downloaded from this link (at Phill's own server)
The intention is that this re-spin with the non-pae kernel will follow the updating/upgrading cycle with point releases of Lubuntu 14.04 LTS.
Examples of non-pae CPUs
1. Early Pentium M with 1.2 GHz clock frequency. (The later Pentium M CPUs have PAE capability even if they lack a PAE flag).
2. Old ViA-processors around 1GHz
3. Transmeta Crusoe
(4. Pre Pentium II CPUs are too old and weak to be tested for this purpose)
You can test for the PAE flag with the following command
grep --color pae /proc/cpuinfo