bonjour à tous 
j’ai téléchargé le pilote ScanGear MP v. 4.10 for Linux (debian Packagearchive) pour la Canon pixma ts 3450 sur le site canon.fr.
je l’ai ensuite installé
scangearmp2-4.10-1-deb$ ./install.sh
[sudo] Mot de passe de philippe :
==================================================
ScanGear MP
Version 4.10
Copyright CANON INC. 2007-2020
==================================================
Commande exécutée = sudo dpkg -iG ./packages/scangearmp2_4.10-1_amd64.deb
(Lecture de la base de données... 324566 fichiers et répertoires déjà installés.)
Préparation du dépaquetage de .../scangearmp2_4.10-1_amd64.deb ...
Dépaquetage de scangearmp2 (4.10-1) sur (4.10-1) ...
Paramétrage de scangearmp2 (4.10-1) ...
L'installation est terminée
tout c’est bien passé, mais ni l’imprimante ni le scanner ne fonctionne
les infos sur mon système
pour l’imprimante
$ dpkg -l | grep cups
ii cups-pk-helper 0.2.6-1+b1 amd64 PolicyKit helper to configure cups with fine-grained privileges
ii libcups2:amd64 2.2.10-6+deb10u4 amd64 Common UNIX Printing System(tm) - Core library
ii libcupsfilters1:amd64 1.21.6-5 amd64 OpenPrinting CUPS Filters - Shared library
ii libcupsimage2:amd64 2.2.10-6+deb10u4 amd64 Common UNIX Printing System(tm) - Raster image library
ii python3-cups 1.9.73-2+b1 amd64 Python3 bindings for CUPS
ii python3-cupshelpers 1.5.11-4 all Python utility modules around the CUPS printing system $ dpkg -l | grep -v ^ii
Souhait=inconnU/Installé/suppRimé/Purgé/H=à garder
| État=Non/Installé/fichier-Config/dépaqUeté/échec-conFig/H=semi-installé/W=attend-traitement-déclenchements
|/ Err?=(aucune)/besoin Réinstallation (État,Err: majuscule=mauvais)
||/ Nom Version Architecture Description
+++-=============================================-============================================-============-===============================================================================
rc airstrike 0.99+1.0pre6a-9 amd64 2d dogfight game in the tradition of 'Biplanes' and 'BIP'
rc dodgindiamond2 0.2.2-3 amd64 Little shoot-'em-up arcade game for one or two players
rc linux-image-4.19.0-10-amd64 4.19.132-1 amd64 Linux 4.19 for 64-bit PCs (signed)
rc linux-image-4.19.0-11-amd64 4.19.146-1 amd64 Linux 4.19 for 64-bit PCs (signed)
rc linux-image-4.19.0-12-amd64 4.19.152-1 amd64 Linux 4.19 for 64-bit PCs (signed)
rc linux-image-4.19.0-8-amd64 4.19.98-1+deb10u1 amd64 Linux 4.19 for 64-bit PCs (signed)
rc linux-image-4.19.0-9-amd64 4.19.118-2+deb10u1 amd64 Linux 4.19 for 64-bit PCs (signed)
rc network-manager-fortisslvpn 1.2.8-2 amd64 network management framework (Fortinet SSLVPN plugin core)
rc openfortivpn 1.8.1-1 amd64 Fortinet client for PPP+SSL VPN tunnel services
rc palapeli 4:18.04.1-1 amd64 jigsaw puzzle game
rc wicd-daemon 1.7.4+tb2-6 all wired and wireless network manager - daemon
rc wicd-gtk
pour le scanner
$ dpkg -l | grep sane
ii libsane:amd64 1.0.27-3.2 amd64 API library for scanners
ii libsane-common 1.0.27-3.2 all API library for scanners -- documentation and support files
ii sane-utils
$ sudo sane-find-scanner -q
found USB scanner (vendor=0x0bda [Generic], product=0x0129 [USB2.0-CRW]) at libusb:001:006
found USB scanner (vendor=0x04a9 [Canon], product=0x18b7 [TS3400 series]) at libusb:001:008
$ ls /etc/sane.d/
abaton.conf dc240.conf hp5400.conf mustek_pp.conf sharp.conf
agfafocus.conf dc25.conf hp.conf mustek_usb.conf sm3840.conf
apple.conf dell1600n_net.conf hpsj5s.conf nec.conf snapscan.conf
artec.conf dll.conf hs2p.conf net.conf sp15c.conf
artec_eplus48u.conf dll.d ibm.conf p5.conf st400.conf
avision.conf dmc.conf kodakaio.conf pie.conf stv680.conf
bh.conf epjitsu.conf kodak.conf pieusb.conf tamarack.conf
canon630u.conf epson2.conf kvs1025.conf pixma.conf teco1.conf
canon.conf epson.conf leo.conf plustek.conf teco2.conf
canon_dr.conf epsonds.conf lexmark.conf plustek_pp.conf teco3.conf
canon_pp.conf fujitsu.conf ma1509.conf qcam.conf test.conf
cardscan.conf genesys.conf magicolor.conf ricoh.conf u12.conf
coolscan2.conf gphoto2.conf matsushita.conf rts8891.conf umax1220u.conf
coolscan3.conf gt68xx.conf microtek2.conf s9036.conf umax.conf
coolscan.conf hp3900.conf microtek.conf saned.conf umax_pp.conf
dc210.conf hp4200.conf mustek.conf sceptre.conf xerox_mfp.conf
$ 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
$ ls /lib/udev/rules.d | grep libsane
60-libsane.rules
j’espere qu’avec ces données vous pourrez m’aider et merci d’avance de votre aide