If you are running Ubuntu 10.04 LTS or 10.10 and your scanner is not supported, then you can try the latest releases of the SANE drivers from my sane-backends PPA. The following steps from the terminal will enable it.
$ sudo add-apt-repository ppa:robert-ancell/sane-backends
$ sudo apt-get update
$ sudo apt-get upgrade
Please feedback to the
SANE project if you continue to have problems!