>$ sane-find-scanner
>found USB scanner (vendor=0x04a9 [Canon], product=0x190f [CanoScan])
>at libusb:003:002 could not open USB device 0x1d6b/0x0002 at 003:001:
>Access denied (insufficient permissions)

This looks like a permission problem: the user who executed
sane-find-scanner is not allowed to access the scanner device.

A "quick and dirty" test to verify this is to run sane-find-scanner as
root.  For example:

  sudo sane-find-scanner

The udev mechanism controls permissions assigned to devices - use "man
udev" to learn more.  For my Epson scanner, I use the configuration file
that follows (change vendor and product codes to match your scanner; lines
that begin with # are comments):

#  File:  /etc/udev/rules.d/10.local.rules
#  Local (RWR) rules for udev.

# Epson scanner    idVendor=04b8, idProduct=012c
SUBSYSTEMS=="usb", ACTION=="add", ATTRS{idVendor}=="04b8", 
ATTRS{idProduct}=="012c", GROUP="users", MODE="0666"

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