Dunno about your 10 year old son, but my 9 year old daughter installed Ubuntu on the playroom computer the other day. It just worked. Ubuntu does have failsafe X which should cut in with a working low graphics mode, if that does not happen then it is a bug and you would be improving ubuntu by filing a bug on launchpad with details of your configuration so that the next person trying to install Ubuntu on whatever kit you have has a smoother ride.
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