I followed the links, did some reading but not sure what all that means. I did install the sane backend
One of your previous posts shows the device is recognized by lsusb.
found USB scanner (vendor=0x04a9 [Canon], product=0x1749 [MG5200 series]) at libusb:001:002
The link I posted at
http://lists.alioth.debian.org/pipermail/sane-devel/2011-July/028816.html says that:
This was posted in July 2011, and I still don't see your model listed in sane-backends. I see that Canon has a
Linux driver for their MG5250 model, but I see nothing for your model. If I were in your shoes, I would go directly to Canon and ask them what the deal is.