Scanner WORKS for me on Ubuntu 11.10!
I have a Xerox WorkCentre PE220, which functions just like a -Samsung SCX-4521F. I've debugged for a few hours and the scanner function finally works!
1) Install samsungmfp-scanner.
2) Now try this! => sudo modprobe usblp
3) You can use 'xsane' or 'Simple Scan' to test... does it work now?
4) If it works, then it means that 'usblp', which has been blacklisted, is the key. To un-blacklist it,
a) modify /etc/modprobe.d/blacklist-cups-usblp.conf
b) Comment the line by prefixing with a '#':
#blacklist usblp
After this step, you don't need to 'sudo modprobe usblp' after starting your machine.
Well, it works for me, but I'm not sure if it can help to solve scanner problems faced by you all. Share you experience here!
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