Forum Linux.débutant Xsane ne fonctionne pas

Impossible de numériser quoique se soit avec mon scanjet, je clique sur numériser de Xsane, la lampe s'allume progresse très très lentement. Elle s'arrête à mi chemin est me donne un message d'erreur:
"Erreur pendant la lecture Erreur d'I/O sur le périphérique"
Au démarrage Xsane me propose de choisir entre 2 scanners alors que je n'en ai qu'1!!
En fait il en trouve deux:

# 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 SCSI driver for your SCSI adapter.

found USB scanner (vendor=0x03f0, product=0x2005) at libusb:006:002
# 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
# necessary.
bash-3.00$ scanimage -L
device `hp_rts88xx:libusb:006:002' is a Hewlett-Packard ScanJet 3530C flatbed scanner
device `hp_rts88xx:libusb:006:002' is a Hewlett-Packard ScanJet 3570C flatbed scanner
bash-3.00$
Quel est le problème? D'où vient cette erreur?
PS: je suis total newbie, fraichement converti.