Et voila :
dubois@Ordi:~$ cat /etc/lsb-release && uname -i && groups && lsusb
DISTRIB_ID=Ubuntu
DISTRIB_RELEASE=20.04
DISTRIB_CODENAME=focal
DISTRIB_DESCRIPTION="Ubuntu 20.04.1 LTS"
x86_64
dubois adm cdrom sudo dip plugdev lpadmin sambashare vboxusers
Bus 004 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
Bus 003 Device 003: ID 413c:2106 Dell Computer Corp. Dell QuietKey Keyboard
Bus 003 Device 002: ID 0461:4d81 Primax Electronics, Ltd Dell N889 Optical Mouse
Bus 003 Device 004: ID 04f9:0448 Brother Industries, Ltd DCP-L3550CDW series
Bus 003 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
Bus 001 Device 005: ID 0403:0000 Future Technology Devices International, Ltd H4SMK 7 Port Hub / Bricked Counterfeit FT232 Serial (UART) IC
Bus 001 Device 004: ID 0403:6001 Future Technology Devices International, Ltd FT232 Serial (UART) IC
Bus 001 Device 003: ID 0529:0003 Aladdin Knowledge Systems Sentinel HL
Bus 001 Device 002: ID 3689:8762 USBKey USBKey
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
dubois@Ordi:~$
dubois@Ordi:~$ dpkg -l | grep sane
ii libsane:amd64 1.0.29-0ubuntu5.2 amd64 API library for scanners
ii libsane-common 1.0.29-0ubuntu5.2 all API library for scanners -- documentation and support files
ii libsane-hpaio:amd64 3.20.3+dfsg0-2 amd64 HP SANE backend for multi-function peripherals
ii libsane1:amd64 1.0.29-0ubuntu5.2 amd64 API library for scanners [transitional package]
ii sane-utils 1.0.29-0ubuntu5.2 amd64 API library for scanners -- utilities
dubois@Ordi:~$
dubois@Ordi:~$ sudo sane-find-scanner -q
[sudo] Mot de passe de dubois :
could not fetch string descriptor: Pipe error
could not fetch string descriptor: Pipe error
found USB scanner (vendor=0x04f9 [Brother], product=0x0448 [DCP-L3550CDW series]) at libusb:003:004
found USB scanner (vendor=0x0403 [FTDI], product=0x6001 [FT232R USB UART]) at libusb:001:004
dubois@Ordi:~$
dubois@Ordi:~$ scanimage -L
device `brother4:bus2;dev1' is a Brother DCP-L3550CDW USB scanner
dubois@Ordi:~$
dubois@Ordi:~$ cat /etc/sane.d/dll.conf
# dll.conf - Configuration file for the SANE dynamic backend loader
#
# Backends can also be enabled by configuration snippets under the dll.d/
# directory -- third party backends can drop their configuration file in
# this in this directory, named after the backend.
#
# The next line enables the network backend; comment it out if you don't
# need to use a remote SANE scanner over the network -- see sane-net(5)
# and saned(8) for details.
net
abaton
agfafocus
apple
artec
artec_eplus48u
as6e
avision
bh
canon
canon630u
canon_dr
#canon_pp
cardscan
coolscan
#coolscan2
coolscan3
#dc210
#dc240
#dc25
dell1600n_net
dmc
epjitsu
#epson
epson2
epsonds
escl
fujitsu
genesys
#gphoto2
gt68xx
hp
hp3500
hp3900
hp4200
hp5400
hp5590
hpljm1005
hpsj5s
hs2p
ibm
kodak
kodakaio
kvs1025
kvs20xx
kvs40xx
leo
lexmark
ma1509
magicolor
matsushita
microtek
microtek2
mustek
#mustek_pp
mustek_usb
mustek_usb2
nec
niash
#p5
pie
pieusb
pint
pixma
plustek
#plustek_pp
#pnm
qcam
ricoh
ricoh2
rts8891
s9036
sceptre
sharp
sm3600
sm3840
snapscan
sp15c
#st400
#stv680
tamarack
teco1
teco2
teco3
#test
u12
umax
umax1220u
#umax_pp
v4l
xerox_mfp
brother4
dubois@Ordi:~$
dubois@Ordi:~$ ls /lib/udev/rules.d | grep libsane
60-libsane.rules
dubois@Ordi:~$
