Lubuntu 14.04 still fits on a CD. You cannot install anything on the computers at your school, but can you at least download the Lubuntu ISO on the school computers? That should not require admin permission.. Once you have downloaded the ISO, can you then burn the ISO to a CD at school. If you are not allowed to do that, merely copy the ISO to a flash drive and take it to a friend's computer where you can burn it to a CD or a flash drive to make it bootable. Once you have done that you can install it to your computer.
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