it's been ages since i last installed .rpm's, i think you should try rpm -ivh package.rpm. but, since you're running debian, why don't you try apt-get install vsftp?!
besides, this is not really the best place to post this kind of question, since it's in no way related to \uperl.
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"one who asks a question is a fool for five minutes; one who does not ask a question remains a fool forever."