Merci pour vos réponses :
Ylag : je l'ai déjà fait ,sans résultat
Xubu1957 :merci beau coup pour le tuto , voilà donc ci dessous le résultat des commandes :
jeanpaul@jeanpaul-g41m-2sh:~$ cat /etc/lsb-release && uname -ir && groups && lsusb
DISTRIB_ID=Ubuntu
DISTRIB_RELEASE=18.04
DISTRIB_CODENAME=bionic
DISTRIB_DESCRIPTION="Ubuntu 18.04.5 LTS"
5.4.0-67-generic x86_64
jeanpaul adm dialout fax cdrom floppy tape sudo audio dip video plugdev lpadmin scanner sambashare anna sambausers
Bus 002 Device 002: ID 8087:8001 Intel Corp.
Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 006 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
Bus 005 Device 002: ID 03f0:1154 Hewlett-Packard
Bus 005 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 001 Device 002: ID 8087:8009 Intel Corp.
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 004 Device 002: ID 1058:2620 Western Digital Technologies, Inc.
Bus 004 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
Bus 003 Device 004: ID 1058:1021 Western Digital Technologies, Inc. Elements Desktop (WDBAAU)
Bus 003 Device 003: ID 093a:2510 Pixart Imaging, Inc. Optical Mouse
Bus 003 Device 005: ID 0d8c:013c C-Media Electronics, Inc. CM108 Audio Controller
Bus 003 Device 002: ID 046d:08da Logitech, Inc. QuickCam Messanger
Bus 003 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
jeanpaul@jeanpaul-g41m-2sh:~$
Puis :
eanpaul@jeanpaul-g41m-2sh:~$ dpkg -l | grep sane
ii libkf5sane-data 17.12.3-0ubuntu1 all scanner library (data files)
ii libkf5sane5 17.12.3-0ubuntu1 amd64 scanner library (runtime)
ii libsane-common 1.0.27-1~experimental3ubuntu2.4 all API library for scanners -- documentation and support files
ii libsane-hpaio:amd64 3.17.10+repack0-5 amd64 HP SANE backend for multi-function peripherals
ii libsane1:amd64 1.0.27-1~experimental3ubuntu2.4 amd64 API library for scanners
ii libsane1:i386 1.0.27-1~experimental3ubuntu2.4 i386 API library for scanners
ii sane-utils 1.0.27-1~experimental3ubuntu2.4 amd64 API library for scanners -- utilities
ii xsane 0.999-5ubuntu2 amd64 featureful graphical frontend for SANE (Scanner Access Now Easy)
ii xsane-common 0.999-5ubuntu2 all xsane architecture independent files
jeanpaul@jeanpaul-g41m-2sh:~$
jeanpaul@jeanpaul-g41m-2sh:~$ sudo sane-find-scanner -q
[sudo] Mot de passe de jeanpaul :
could not fetch string descriptor: Pipe error
could not fetch string descriptor: Pipe error
found USB scanner (vendor=0x03f0, product=0x1154) at libusb:005:002
could not fetch string descriptor: Pipe error
could not fetch string descriptor: Pipe error
could not fetch string descriptor: Pipe error
could not fetch string descriptor: Pipe error
found USB scanner (vendor=0x046d, product=0x08da) at libusb:003:002
jeanpaul@jeanpaul-g41m-2sh:~$
jeanpaul@jeanpaul-g41m-2sh:~$scanimage -L
device `hpaio:/usb/ENVY_Photo_7100_series?serial=TH7A62T11V' is a Hewlett-Packard ENVY_Photo_7100_series all-in-one
device `hpaio:/net/envy_photo_7100_series?ip=192.168.1.12&queue=false' is a Hewlett-Packard envy_photo_7100_series all-in-one
jeanpaul@jeanpaul-g41m-2sh:~$
jeanpaul@jeanpaul-g41m-2sh:~$ ls /etc/sane.d/
abaton.conf dll.d leo.conf rts8891.conf
agfafocus.conf dmc.conf lexmark.conf s9036.conf
apple.conf epjitsu.conf ma1509.conf saned.conf
artec.conf epson2.conf magicolor.conf sceptre.conf
artec_eplus48u.conf epson.conf matsushita.conf sharp.conf
avision.conf epsonds.conf microtek2.conf sm3840.conf
bh.conf fujitsu.conf microtek.conf snapscan.conf
canon630u.conf genesys.conf mustek.conf sp15c.conf
canon.conf gphoto2.conf mustek_pp.conf st400.conf
canon_dr.conf gt68xx.conf mustek_usb.conf stv680.conf
canon_pp.conf hp3900.conf nec.conf tamarack.conf
cardscan.conf hp4200.conf net.conf teco1.conf
coolscan2.conf hp5400.conf p5.conf teco2.conf
coolscan3.conf hp.conf pie.conf teco3.conf
coolscan.conf hpsj5s.conf pieusb.conf test.conf
dc210.conf hs2p.conf pixma.conf u12.conf
dc240.conf ibm.conf plustek.conf umax1220u.conf
dc25.conf kodakaio.conf plustek_pp.conf umax.conf
dell1600n_net.conf kodak.conf qcam.conf umax_pp.conf
dll.conf kvs1025.conf ricoh.conf xerox_mfp.conf
jeanpaul@jeanpaul-g41m-2sh:~$
eanpaul@jeanpaul-g41m-2sh:~$ 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
avision
artec
artec_eplus48u
as6e
bh
canon
canon630u
canon_dr
#canon_pp
cardscan
coolscan
#coolscan2
coolscan3
#dc25
#dc210
#dc240
dell1600n_net
dmc
epjitsu
#epson
epson2
epsonds
fujitsu
#gphoto2
genesys
gt68xx
hp
hp3900
hpsj5s
hp3500
hp4200
hp5400
hp5590
hpljm1005
hs2p
ibm
kodak
kodakaio
kvs1025
kvs20xx
leo
lexmark
ma1509
magicolor
matsushita
microtek
microtek2
mustek
#mustek_pp
mustek_usb
mustek_usb2
nec
niash
#p5
pie
pint
pixma
plustek
#plustek_pp
#pnm
qcam
ricoh
rts8891
s9036
sceptre
sharp
sm3600
sm3840
snapscan
sp15c
#st400
#stv680
tamarack
teco1
teco2
teco3
#test
u12
umax
#umax_pp
umax1220u
v4l
xerox_mfp
jeanpaul@jeanpaul-g41m-2sh:~$ ls /lib/udev/rules.d | grep libsane
60-libsane1.rules
j'espère que ces informations seront utiles
PS je ne recois plus les mail de suivi de la discussion (ils ne sont pas dans les indésirables)