Most hardware I have added has been hassle free with Ubuntu.
Not so with printers.
I installed a Canon Pixma TS 9120 printer/scanner.
It prints fine, but it will not scan.
Xsane says "No devices available."
However,
sudo sane-find-scanner
# 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=0x04a9 [Canon], product=0x1820 [TS9100 series]) at libusb:002:003
# 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.
Not so with printers.
I installed a Canon Pixma TS 9120 printer/scanner.
It prints fine, but it will not scan.
Xsane says "No devices available."
However,
sudo sane-find-scanner
# 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=0x04a9 [Canon], product=0x1820 [TS9100 series]) at libusb:002:003
# 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.