A followup on previous comment:
I installed and used xsane, and it works without fail.
Reviewing the information on the link you provided: ====== "if everything works with xsane, the problem is within Simple Scan and we will look into it" =======
It appears the problem is with Simple Scan.
xscan info:
Vendor: Canon Model: CanoScan N1220U Type: flatbed scanner Device: 004 Loaded backend: plustek:libusb:002 Sane version: 1.0.22
A followup on previous comment:
I installed and used xsane, and it works without fail.
Reviewing the information on the link you provided:
======
"if everything works with xsane, the problem is within Simple Scan and we will look into it"
=======
It appears the problem is with Simple Scan.
xscan info:
Vendor: Canon
Model: CanoScan N1220U
Type: flatbed scanner
Device: 004
Loaded backend: plustek:libusb:002
Sane version: 1.0.22