I've done *all* those steps and it did not work ... and yes, it's raid 10 with 4 identical drives. It looks like this is a known problem with a workaround (and, perhaps, a solution in future releases). One can either use a workaround (which I did not try) or alternate install CD.
Back to my story -- I thought I was stuck between a rock and a hard place, b/c alternate install CD was not detecting my keyboard (and live CD was not detecting my raid) ... eventually I got this situation resolved by making alternate CD recognize my keyboard correctly. Everything went smoothly from then on.
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