Just bought a LiDE210, and got it working with lucid 64 and the robert-ancell ppa.
The only change to the above instructions is the product id in 40-libsane.rules:
Code:
# Canon CanoScan Lide 210
ATTRS{idVendor}=="04a9", ATTRS{idProduct}=="190a", ENV{libsane_matched}="yes"
For other models you can get the required information by plugging in your scanner and typing lsusb:
Code:
Bus 001 Device 008: ID 04a9:190a Canon, Inc.
the 04a9 is the idVendor number (canon in this case)
the 190a is the idProduct.