[Ubuntu 11.04]system can't detect my sd card reader

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http://linuxfloat.org – Hi guys, I'm plugging in an sd card reader into my Ubuntu Natty machine, and the computer can see the slots of the reader, but it can't see the card itself.I tried plugging in the reader with a card into a windows machine, and it worked fine.  what's going on? (HowTos)