I went to scan in some pictures today with my new Karmic install and ran into problems. When I went to scan I would get "Failed to start scanner: Invalid argument" Some Googling revealed that many people are experiencing broken scanning after upgrading to Karmic with various printers. A little more searching revealed the solution. I think that there is probably an even better solution, but this is how I got scanning to work.
First I installed libsane-extras:
sudo aptitude install libsane-extras
Next I edited saned.conf to enable the epson driver.
gksudo gedit /etc/init.d/sane.d/dll.conf
In this file I removed the # at the line that read #epson
To get the parameters for me scanner I ran:
# sane-find-scanner will now attempt to detect your scanner. If the
# result is different from what you expected, first make sure your
# scanner is powered up and properly connected to your computer.
# No SCSI scanners found. If you expected something different, make sure that
# you have loaded a kernel SCSI driver for your SCSI adapter.
found USB scanner (vendor=0x04b8, product=0x0839) at libusb:001:003
found USB scanner (vendor=0x0bc7 [X10 Wireless Technology Inc], product=0x0004 [USB Receiver]) at libusb:007:002
# Your USB scanner was (probably) detected. It may or may not be supported by
# SANE. Try scanimage -L and read the backend's manpage.
# Not checking for parallel port scanners.
# Most Scanners connected to the parallel port or other proprietary ports
# can't be detected by this program.
# You may want to run this program as root to find all devices. Once you
# found the scanner devices, be sure to adjust access permissions as
Here the line that read "found USB scanner (vendor=0x04b8, product=0x0839) at libusb:001:003" was the key. These parameters needed to go in the epson drivers file.
gksudo gedit /etc/init.d/sane.d/epson.conf
I replaced the line that read "usb" to read "usb 0x4b8 0x0839" Finally I just needed to restart the sane daemon.
sudo /etc/init.d/saned restart
After this scanning finally worked.