This file is indexed.

/etc/sane.d/mustek_usb.conf is in libsane 1.0.23-3ubuntu3.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

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# mustek_usb.conf: Configuration file for Mustek USB scanner
# Read man sane-mustek_usb for documentation

# If USB errors occur, using this option may help
#option max_block_size 1024

# Autodetect 1200 UB and Trust Compact Scan USB 19200
usb 0x055f 0x0006

# Autodetect 1200 USB (not supported)
# usb 0x055f 0x0003

# Autodetect 1200 CU
usb 0x055f 0x0001

# Autodetect 1200 CU Plus
usb 0x055f 0x0008

# Autodetect 600 CU
usb 0x055f 0x0002

# Autodetect 600 USB (not supported)
usb 0x055f 0x0873

# If autodetection doesn't work uncomment or add your device file and one
# suitable option (1200ub is also for Trust Compact Scan USB 19200).

#/dev/usb/scanner0
#option 1200ub
#option 1200cu
#option 1200cu_plus
#option 600cu

#/dev/usbscanner0
#option 1200ub
#option 1200cu
#option 1200cu_plus
#option 600cu