Is your scanner working in Linux now?  I recently had a similar problem
with a SnapScan 1212U in Hardy:

sane-find-scanner
...
found USB scanner (vendor=0x06bd [AGFA ], product=0x2061 [SNAPSCAN]) at 
libusb:003:006

scanimage -L
device `snapscan:libusb:003:006' is a AGFA SNAPSCAN flatbed scanner

When I tried to scan something from the command line it provided an important 
clue:
scanimage -d snapscan:libusb:003:006 >test.pnm
[snapscan] Cannot open firmware file /usr/share/sane/snapscan/snap1212u.bin.
[snapscan] Edit the firmware file entry in snapscan.conf.
scanimage: open of device snapscan:libusb:003:006 failed: Invalid argument

I had forgotten that my scanner  requires firmware to be uploaded to it every 
time it's turned on.  I had previously already extracted "snap1212u.bin" from 
the Windows drivers.  I put it in "/etc/share/sane/snapscan" and edited the 
firmware line "/etc/sane.d/snapscan.conf" to load it:
firmware /usr/share/sane/snapscan/snap1212u.bin

It now works:
scanimage -d snapscan:libusb:003:006 >test.pnm
[snapscan] Scanner warming up - waiting 15 seconds.

It generated test.pnm as expected.

-- 
scanner port detection
https://bugs.launchpad.net/bugs/239930
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