Help getting MFC5840 CN scanner functional in Ubuntu 9.04 and or 9.10

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http://www.ubuntux.org – I'm still trying to find help with getting my scanner to function under Ubuntu. It once was functioning in 9.04 but ceased about the time Xsane updated from 0.995 to 0.996. I have dementia and cannot stay focused long enough to solve the problem. In fact I'm not sure how I got scanner working in first place. I remember trying command line driver install and then synaptic install prob. several times each and one day it worked. I'm starting to fade in thinking power as I write this. One problem I'm having is understanding su and sudo. Most times when I use su and then type password it says (Distributions)