First, thanks to everyone for the help. But I think it would be wise to reiterate, perhaps more clearly, that wireless scanning is possible in Ubuntu with the MX410, but apparently only through the Canon Scangear Software (Scan Gear MP), which is available, tested, and working with Precise, by installing the following .deb:
http://support-sg.canon-asia.com/con...100330601.html
Terminal command to run the software, or if you want to make a menu link, is scangearmp.
However, (the best way for GUI users) Scan Gear is also conveniently accessible through GIMP by default - File > Create > ScanGear MP. So make sure you have GIMP installed, then all you have to do is ignore the warning that ScanGear isn't recognizing the scanner (assuming you've already got it turned on and broadcasting wirelessly) then click "Update Scanner List" and it will detect the MX410 scanner. That's it. Wireless scanning on Ubuntu with MX410.
Very easy. Hope that helps. Hurray for Canon for supporting Ubuntu!
P.S.
I didn't have to install the MX410 printer drivers in 12.04, as they seem to be included with Ubuntu now, as the MX410 now works out of the box. I only needed to install ScanGear to get wireless scanning to work.
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