voila ce que cela donne 
sophie@sophie-SVE1513B1EW:~$ dpkg -l | grep hplip
ii  hplip-data                                 3.17.10+repack0-5                                all          HP Linux Printing and Imaging - data files

et 
sophie@sophie-SVE1513B1EW:~$ hp-check
error: Unable to locate models.dat file
Saving output in log file: /home/sophie/hp-check.log

HP Linux Imaging and Printing System (ver. 0.0.0)
Dependency/Version Check Utility ver. 15.1

Copyright (c) 2001-18 HP Development Company, LP
This software comes with ABSOLUTELY NO WARRANTY.
This is free software, and you are welcome to distribute it
under certain conditions. See COPYING file for more details.

Note: hp-check can be run in three modes:
1. Compile-time check mode (-c or --compile): Use this mode before compiling the
HPLIP supplied tarball (.tar.gz or .run) to determine if the proper dependencies
are installed to successfully compile HPLIP.                                    
2. Run-time check mode (-r or --run): Use this mode to determine if a distro    
supplied package (.deb, .rpm, etc) or an already built HPLIP supplied tarball   
has the proper dependencies installed to successfully run.                      
3. Both compile- and run-time check mode (-b or --both) (Default): This mode    
will check both of the above cases (both compile- and run-time dependencies).   

Check types:                                                                    
a. EXTERNALDEP - External Dependencies                                          
b. GENERALDEP - General Dependencies (required both at compile and run time)    
c. COMPILEDEP - Compile time Dependencies                                       
d. [All are run-time checks]                                                    
PYEXT SCANCONF QUEUES PERMISSION                                                

Status Types:
    OK
    MISSING       - Missing Dependency or Permission or Plug-in
    INCOMPAT      - Incompatible dependency-version or Plugin-version

-Traceback (most recent call last):
  File "/usr/bin/hp-check", line 861, in <module>
    dep.core.init()
  File "/usr/share/hplip/installer/core_install.py", line 525, in init
    self.distro_name = self.distros_index[self.distro]
KeyError: 0
sophie@sophie-SVE1513B1EW:~$
Je laisse la main aux autres aidants.
Bonjour,

Vu au #21: 
sophie@sophie-SVE1513B1EW:~$ hp-check
error: Unable to locate models.dat file
Le fichier models.dat est dans le paquet libsane-hpaio, dont j'avais suggéré la réinstallation au commentaire #2. 
sudo apt install libsane-hpaio
...redémarrer et réessayer ensuite le scan?

Ajout:
Pour essayer de déterminer si le greffon se serait installé correctement, vérifier si le répertoire /usr/share/hplip/scan/plugins existe et contient des fichiers du genre de bb_*.so: 
ls -l /usr/share/hplip/scan/plugins
Si le scan semble fonctionner seulement en «root», il se pourrait que ce soit un problème de droits d'accès pour l'utilisateur normal...?
Faudrait au moins l'avis de @grigouille sur ce point...

A+
j'ai essayé , redémarré mais cela ne fonctionne toujours pas
pour la deuxiéme intervention cela donne ca 
sophie@sophie-SVE1513B1EW:~$ ls -l /usr/share/hplip/scan/plugins
total 8988
lrwxrwxrwx 1 root root      47 déc.  11 09:00 bb_escl.so -> /usr/share/hplip/scan/plugins/bb_escl-x86_64.so
-rwxr-xr-x 1 root root   45784 déc.  11 09:00 bb_escl-x86_64.so
lrwxrwxrwx 1 root root      50 déc.  11 09:00 bb_marvell.so -> /usr/share/hplip/scan/plugins/bb_marvell-x86_64.so
-rwxr-xr-x 1 root root   37957 déc.  11 09:00 bb_marvell-x86_64.so
lrwxrwxrwx 1 root root      50 déc.  11 09:00 bb_orblite.so -> /usr/share/hplip/scan/plugins/bb_orblite-x86_64.so
-rwxr-xr-x 1 root root 9002592 déc.  11 09:00 bb_orblite-x86_64.so
lrwxrwxrwx 1 root root      49 déc.  11 09:00 bb_soapht.so -> /usr/share/hplip/scan/plugins/bb_soapht-x86_64.so
-rwxr-xr-x 1 root root   59314 déc.  11 09:00 bb_soapht-x86_64.so
lrwxrwxrwx 1 root root      47 déc.  11 09:00 bb_soap.so -> /usr/share/hplip/scan/plugins/bb_soap-x86_64.so
-rwxr-xr-x 1 root root   48353 déc.  11 09:00 bb_soap-x86_64.so
sophie@sophie-SVE1513B1EW:~$
Re,

Regarde mon ajout au #23.

Si tu as réinstallé libsane-hpaio, peut-être réessayer la commande: 
hp-check
...histoire de voir si ça ne serait pas plus parlant?

A+
Re,

Ton nouveau retour au #24 laisse croire que le greffon serait bien installé, à mon avis.
Resterait la piste des droits d'exécution pour l'utilisateur courant; là je ne sais pas comment procéder pour diagnostiquer, désolé...

A+
sophie@sophie-SVE1513B1EW:~$ hp-check
Saving output in log file: /home/sophie/hp-check.log

HP Linux Imaging and Printing System (ver. 3.17.10)
Dependency/Version Check Utility ver. 15.1

Copyright (c) 2001-18 HP Development Company, LP
This software comes with ABSOLUTELY NO WARRANTY.
This is free software, and you are welcome to distribute it
under certain conditions. See COPYING file for more details.

Note: hp-check can be run in three modes:
1. Compile-time check mode (-c or --compile): Use this mode before compiling the
HPLIP supplied tarball (.tar.gz or .run) to determine if the proper dependencies
are installed to successfully compile HPLIP.                                    
2. Run-time check mode (-r or --run): Use this mode to determine if a distro    
supplied package (.deb, .rpm, etc) or an already built HPLIP supplied tarball   
has the proper dependencies installed to successfully run.                      
3. Both compile- and run-time check mode (-b or --both) (Default): This mode    
will check both of the above cases (both compile- and run-time dependencies).   

Check types:                                                                    
a. EXTERNALDEP - External Dependencies                                          
b. GENERALDEP - General Dependencies (required both at compile and run time)    
c. COMPILEDEP - Compile time Dependencies                                       
d. [All are run-time checks]                                                    
PYEXT SCANCONF QUEUES PERMISSION                                                

Status Types:
    OK
    MISSING       - Missing Dependency or Permission or Plug-in
    INCOMPAT      - Incompatible dependency-version or Plugin-version

/Gtk-Message: 12:19:04.583: Failed to load module "canberra-gtk-module"
 
---------------
| SYSTEM INFO |
---------------

 Kernel: 4.15.0-126-generic #129-Ubuntu SMP Mon Nov 23 18:53:38 UTC 2020 GNU/Linux
 Host: sophie-SVE1513B1EW
 Proc: 4.15.0-126-generic #129-Ubuntu SMP Mon Nov 23 18:53:38 UTC 2020 GNU/Linux
 Distribution: 12 18.04
 Bitness: 64 bit


-----------------------
| HPLIP CONFIGURATION |
-----------------------

HPLIP-Version: HPLIP 3.17.10
HPLIP-Home: /usr/share/hplip
HPLIP-Installation: Auto installation is supported for ubuntu distro  18.04 version 

Current contents of '/etc/hp/hplip.conf' file:
# hplip.conf.  Generated from hplip.conf.in by configure.

[hplip]
version=3.17.10

[dirs]
home=/usr/share/hplip
run=/var/run
ppd=/usr/share/ppd/hplip/HP
ppdbase=/usr/share/ppd/hplip
doc=/usr/share/doc/hplip
html=/usr/share/doc/hplip-doc
icon=no
cupsbackend=/usr/lib/cups/backend
cupsfilter=/usr/lib/cups/filter
drv=/usr/share/cups/drv
bin=/usr/bin
apparmor=/etc/apparmor.d
# Following values are determined at configure time and cannot be changed.
[configure]
network-build=yes
libusb01-build=no
pp-build=yes
gui-build=yes
scanner-build=yes
fax-build=yes
dbus-build=yes
cups11-build=no
doc-build=yes
shadow-build=no
hpijs-install=yes
foomatic-drv-install=yes
foomatic-ppd-install=yes
foomatic-rip-hplip-install=no
hpcups-install=yes
cups-drv-install=yes
cups-ppd-install=no
internal-tag=3.17.10
restricted-build=no
ui-toolkit=qt5
qt3=no
qt4=no
qt5=yes
policy-kit=yes
lite-build=no
udev_sysfs_rules=no
hpcups-only-build=no
hpijs-only-build=no
apparmor_build=no


Current contents of '/var/lib/hp/hplip.state' file:
[plugin]
installed = 1
eula = 1
version = 3.20.11



Current contents of '~/.hplip/hplip.conf' file:
[upgrade]
notify_upgrade = true
last_upgraded_time = 1607532959
pending_upgrade_time = 0
latest_available_version = 3.17.10

[last_used]
device_uri = hpaio:/usb/HP_LaserJet_MFP_M28-M31?serial=VNC4K95154

[installation]
date_time = 12/11/20 12:19:07
version = 3.17.10


 <Package-name>        <Package-Desc>      <Required/Optional> <Min-Version> <Installed-Version> <Status>   <Comment>

-------------------------
| External Dependencies |
-------------------------

 cups                 CUPS - Common Unix Printing System                           REQUIRED        1.1             2.2.7           OK         'CUPS Scheduler is running'
 gs                   GhostScript - PostScript and PDF language interpreter and previewer REQUIRED        7.05            9.26            OK         -
Gtk-Message: 12:19:08.761: Failed to load module "canberra-gtk-module"
Gtk-Message: 12:19:08.791: Failed to load module "canberra-gtk-module"
 xsane                xsane - Graphical scanner frontend for SANE                  OPTIONAL        0.9             0.999           OK         -
 scanimage            scanimage - Shell scanning program                           OPTIONAL        1.0             1.0.27          OK         -
 dbus                 DBus - Message bus system                                    REQUIRED        -               1.12.2          OK         -
 policykit            PolicyKit - Administrative policy framework                  OPTIONAL        -               0.105           OK         -
 network              network -wget                                                OPTIONAL        -               1.19.4          OK         -
 avahi-utils          avahi-utils                                                  OPTIONAL        -               0.7             OK         -

------------------------
| General Dependencies |
------------------------

 libjpeg              libjpeg - JPEG library                                       REQUIRED        -               -               OK         -
 cups-devel           CUPS devel- Common Unix Printing System development files    REQUIRED        -               2.2.7           OK         -
 cups-image           CUPS image - CUPS image development files                    REQUIRED        -               2.2.7           OK         -
 libpthread           libpthread - POSIX threads library                           REQUIRED        -               b'2.27'         OK         -
 libusb               libusb - USB library                                         REQUIRED        -               1.0             OK         -
 sane                 SANE - Scanning library                                      REQUIRED        -               -               OK         -
 sane-devel           SANE - Scanning library development files                    REQUIRED        -               -               OK         -
 libavahi-dev         libavahi-dev                                                 REQUIRED        -               -               OK         -
 libnetsnmp-devel     libnetsnmp-devel - SNMP networking library development files REQUIRED        5.0.9           5.7.3           OK         -
 libcrypto            libcrypto - OpenSSL cryptographic library                    REQUIRED        -               1.1.1           OK         -
 python3X             Python 2.2 or greater - Python programming language          REQUIRED        2.2             3.6.9           OK         -
 python3-notify2      Python libnotify - Python bindings for the libnotify Desktop notifications OPTIONAL        -               -               OK         -
 python3-pyqt4-dbus   PyQt 4 DBus - DBus Support for PyQt4                         OPTIONAL        4.0             4.12.1          OK         -
 python3-pyqt4        PyQt 4- Qt interface for Python (for Qt version 4.x)         REQUIRED        4.0             4.12.1          OK         -
 python3-dbus         Python DBus - Python bindings for DBus                       REQUIRED        0.80.0          1.2.6           OK         -
 python3-xml          Python XML libraries                                         REQUIRED        -               2.2.5           OK         -
 python3-devel        Python devel - Python development files                      REQUIRED        2.2             3.6.9           OK         -
 python3-pil          PIL - Python Imaging Library (required for commandline scanning with hp-scan) OPTIONAL        -               8.0.1           OK         -
 python3-reportlab    Reportlab - PDF library for Python                           OPTIONAL        2.0             3.4.0           OK         -

--------------
| COMPILEDEP |
--------------

 libtool              libtool - Library building support services                  REQUIRED        -               2.4.6           OK         -
 gcc                  gcc - GNU Project C and C++ Compiler                         REQUIRED        -               7.5.0           OK         -
 make                 make - GNU make utility to maintain groups of programs       REQUIRED        3.0             4.1             OK         -

---------------------
| Python Extentions |
---------------------

 cupsext              CUPS-Extension                                               REQUIRED        -               3.17.10         OK         -
 hpmudext             IO-Extension                                                 REQUIRED        -               3.17.10         OK         -

----------------------
| Scan Configuration |
----------------------

 hpaio                HPLIP-SANE-Backend                                           REQUIRED        -               3.17.10         OK         'hpaio found in /etc/sane.d/dll.conf'
 scanext              Scan-SANE-Extension                                          REQUIRED        -               3.17.10         OK         -

------------------------------
| DISCOVERED SCANNER DEVICES |
------------------------------

No Scanner found.

--------------------------
| DISCOVERED USB DEVICES |
--------------------------

No devices found.

---------------------------------
| INSTALLED CUPS PRINTER QUEUES |
---------------------------------

 


Type: Unknown
Device URI: usb://HP/LaserJet%20MFP%20M28-M31?serial=VNC4K95154


--------------
| PERMISSION |
--------------

error: Unsupported model: HP_LaserJet_MFP_M28-M31
No errors or warnings.

Done.
sophie@sophie-SVE1513B1EW:~$
ce qui est étrange c'est que entre deux manipulations le scanner a fonctionné avant que je supprime des paquets inutiles 
sophie@sophie-SVE1513B1EW:~$ dpkg -l | awk '/^rc/{print $2}' | xargs -r sudo dpkg -P
bon ça n'avait pas l'air d’être parfaitement propre, il semblait avoir des défauts mais après la purge le scanner ne fonctionnait plus
Lance : 
sudo apt update
pour voir si des messages ressortent.
et voila 
sophie@sophie-SVE1513B1EW:~$ sudo apt update
[sudo] Mot de passe de sophie : 
Atteint :1 http://fr.archive.ubuntu.com/ubuntu bionic InRelease
Atteint :2 http://ppa.launchpad.net/vincent-vandevyvre/vvv/ubuntu bionic InRelease
Réception de :3 http://fr.archive.ubuntu.com/ubuntu bionic-updates InRelease [88,7 kB]
Ign :4 http://ppa.launchpad.net/webupd8team/unstable/ubuntu bionic InRelease   
Atteint :5 https://repo.skype.com/deb stable InRelease                         
Réception de :6 http://security.ubuntu.com/ubuntu bionic-security InRelease [88,7 kB]
Err :7 http://ppa.launchpad.net/webupd8team/unstable/ubuntu bionic Release     
  404  Not Found [IP : 91.189.95.83 80]
Réception de :8 http://fr.archive.ubuntu.com/ubuntu bionic-backports InRelease [74,6 kB]
Réception de :9 http://fr.archive.ubuntu.com/ubuntu bionic-updates/main amd64 DEP-11 Metadata [295 kB]
Réception de :10 http://fr.archive.ubuntu.com/ubuntu bionic-updates/universe amd64 Packages [1694 kB]
Réception de :11 http://security.ubuntu.com/ubuntu bionic-security/main amd64 DEP-11 Metadata [48,9 kB]
Réception de :12 http://security.ubuntu.com/ubuntu bionic-security/universe amd64 DEP-11 Metadata [59,5 kB]
Réception de :13 http://security.ubuntu.com/ubuntu bionic-security/multiverse amd64 DEP-11 Metadata [2464 B]
Réception de :14 http://fr.archive.ubuntu.com/ubuntu bionic-updates/universe i386 Packages [1548 kB]
Réception de :15 http://fr.archive.ubuntu.com/ubuntu bionic-updates/universe amd64 DEP-11 Metadata [288 kB]
Réception de :16 http://fr.archive.ubuntu.com/ubuntu bionic-updates/multiverse amd64 DEP-11 Metadata [2468 B]
Réception de :17 http://fr.archive.ubuntu.com/ubuntu bionic-backports/universe amd64 DEP-11 Metadata [9288 B]
Lecture des listes de paquets... Fait                             
E: Le dépôt http://ppa.launchpad.net/webupd8team/unstable/ubuntu bionic Release n'a pas de fichier Release.
N: Les mises à jour depuis un tel dépôt ne peuvent s'effectuer de manière sécurisée, et sont donc désactivées par défaut.
N: Voir les pages de manuel d'apt-secure(8) pour la création des dépôts et les détails de configuration d'un utilisateur.
sophie@sophie-SVE1513B1EW:~$
Bonjour,

Vu au #27: 
HPLIP-Version: HPLIP 3.17.10
....
error: Unsupported model: HP_LaserJet_MFP_M28-M31
No errors or warnings.

Done.
sophie@sophie-SVE1513B1EW:~$
Là je ne sais pas quoi en penser, je croyais que tu avais installé hplip 3.20.11, mais il semblerait que ce soit plutôt en version 3.17.10?
Il te faudrait peut-être récupérer le fichier *.run hplip-3.20.11.run sur le site developers.hp.com pour installer cette version de hplip?

Mais encore là, faudrait que d'autres plus compétent(e)s que moi confirment...

A+
je vais tenter de re installer le fichier hplip -320.11 pour voir
@xubu1957:

Bonjour!

Le dépôt n'a pas de branche active pour Bionic 18.04, faudrait en supprimer l'entrée dans les sources: 
sudo add-apt-repository --remove ppa:webupd8team/unstable
...devrait faire l'affaire?

A+
Bonjour,
zaer au #33 a écritje vais tenter de re installer le fichier hplip -320.11 pour voir
On s'entend sur le fait qu'il s'agit de hplip en version 3.20.11 par l'entremise du fichier hplip-3.20.11.run, et non du greffon hplip-3.20.11-plugin.run (qui semble déjà installé, voir le commentaire #24...) ?

Une fois tout cela fait, tu pourrais tenter la réinstallation complète de l'imprimante:
Commencer par désinstaller ce qui est déjà présent: 
hp-setup -ir
...assure-toi que toutes les instances de ton imprimante sont bien supprimées, quitte à refaire la procédure plus d'une fois.

Pour ensuite réinstaller: 
hp-setup -iax
C'est la procédure standard souvent proposée par @grigouille pour réinstaller une imprimante via hplip.

A+
salut
concernant la désinstallation
ce doit il donner ça ? avant que je continue 
sophie@sophie-SVE1513B1EW:~$ hp-setup -ir

HP Linux Imaging and Printing System (ver. 3.20.11)
Printer/Fax Setup Utility ver. 9.0

Copyright (c) 2001-18 HP Development Company, LP
This software comes with ABSOLUTELY NO WARRANTY.
This is free software, and you are welcome to distribute it
under certain conditions. See COPYING file for more details.


----------------------------
| REMOVING PRINT/FAX QUEUE |
----------------------------

error: No device found that support this feature.
Removing 'None : None' Queue
error: Failed to delete None Print/Fax queue. Error : client-error-not-found
sophie@sophie-SVE1513B1EW:~$
et oui j'ai bien telecharger le fichier
hplip-3.20.11(1).run
Bonjour,

Si ton imprimante était bien branchée et allumée, hp-setup n'a pas détecté d'appareil susceptible d'être désinstallé.
Lance la commande d'installation (avec l'imprimante bien connectée...): 
hp-setup -iagx
...l'option « g » sert à activer le mode «débuggage» afin de rendre le retour de la commande plus verbeux.

?
hello
voila j'ai fait comme tu as dit voici le résultat dans le terminal

sophie@sophie-SVE1513B1EW:~$ hp-setup -iagx

HP Linux Imaging and Printing System (ver. 3.20.11)
Printer/Fax Setup Utility ver. 9.0

Copyright (c) 2001-18 HP Development Company, LP
This software comes with ABSOLUTELY NO WARRANTY.
This is free software, and you are welcome to distribute it
under certain conditions. See COPYING file for more details.

hp-setup[4130]: debug: param=
hp-setup[4130]: debug: selected_device_name=None

--------------------------------
| SELECT CONNECTION (I/O) TYPE |
--------------------------------

  Num       Connection  Description                                               
            Type                                                                  
  --------  ----------  ----------------------------------------------------------
  0*        usb         Universal Serial Bus (USB)                                
  1         net         Network/Ethernet/Wireless (direct connection or JetDirect)

Enter number 0...1 for connection type (q=quit, enter=usb*) ? 

Using connection type: usb

hp-setup[4130]: debug: 
DEVICE CHOOSER setup_fax=True, setup_print=True
hp-setup[4130]: debug: Cache miss: hp_laserjet_mfp_m28-m31
hp-setup[4130]: debug: Reading file: /usr/share/hplip/data/models/models.dat
hp-setup[4130]: debug: Searching for section [hp_laserjet_mfp_m28-m31] in file /usr/share/hplip/data/models/models.dat
hp-setup[4130]: debug: Found section [hp_laserjet_mfp_m28-m31] in file /usr/share/hplip/data/models/models.dat
hp-setup[4130]: debug: getDeviceUri(None, None, ('hp',), None, , True)
hp-setup[4130]: debug: Mode=0

Setting up device: hp:/usb/HP_LaserJet_MFP_M28-M31?serial=VNC4K95154


hp-setup[4130]: debug: Model=HP_LaserJet_MFP_M28-M31
hp-setup[4130]: debug: (CUPS 1.2.x) Getting list of PPDs using CUPS_GET_PPDS...
hp-setup[4130]: debug: CUPS PPD base path = /usr/share/cups/model
hp-setup[4130]: debug: Foomatic PPD base path = /usr/share/ppd
hp-setup[4130]: debug: Exception: 4 (Unknown/invalid device-uri field)
hp-setup[4130]: debug: Exception: 4 (Unknown/invalid device-uri field)

---------------------
| PRINT QUEUE SETUP |
---------------------

hp-setup[4130]: debug: Exception: 4 (Unknown/invalid device-uri field)
Using queue name: HP_LaserJet_MFP_M28-M31
Locating PPD file... Please wait.
hp-setup[4130]: debug: Matching PPD list to model  laserjet_mfp_m28-m31...
hp-setup[4130]: debug: []
hp-setup[4130]: debug: No PPD found for model laserjet_mfp_m28-m31 using new algorithm. Trying old algorithm...
hp-setup[4130]: debug: 1st stage edit distance match
hp-setup[4130]: debug: Determining edit distance from laserjet_mfp_m28-m31 (only showing edit distances < 4)...
hp-setup[4130]: debug: dist('laserjet_mfp_m28-m31') = 0
hp-setup[4130]: debug: dist('laserjet_mfp_m28-m31') = 0
hp-setup[4130]: debug: Min. dist = 0
hp-setup[4130]: debug: {'drv:///hp/hpcups.drv/hp-laserjet_mfp_m28-m31.ppd': 'HP LaserJet MFP m28-m31, hpcups 3.20.11', 'lsb/usr/HP/hp-laserjet_mfp_m28-m31.ppd.gz': 'HP LaserJet MFP m28-m31, hpcups 3.20.11'}
hp-setup[4130]: debug: 2nd stage matching with model number
hp-setup[4130]: debug: model_number=28
hp-setup[4130]: debug: Factor = 1
hp-setup[4130]: debug: mins_model_number= 28
hp-setup[4130]: debug: mins_adj_model_number=28
hp-setup[4130]: debug: adj_model_number=28
hp-setup[4130]: debug: match
hp-setup[4130]: debug: {'drv:///hp/hpcups.drv/hp-laserjet_mfp_m28-m31.ppd': 'HP LaserJet MFP m28-m31, hpcups 3.20.11'}
hp-setup[4130]: debug: ***
hp-setup[4130]: debug: mins_model_number= 28
hp-setup[4130]: debug: mins_adj_model_number=28
hp-setup[4130]: debug: adj_model_number=28
hp-setup[4130]: debug: match
hp-setup[4130]: debug: {'drv:///hp/hpcups.drv/hp-laserjet_mfp_m28-m31.ppd': 'HP LaserJet MFP m28-m31, hpcups 3.20.11', 'lsb/usr/HP/hp-laserjet_mfp_m28-m31.ppd.gz': 'HP LaserJet MFP m28-m31, hpcups 3.20.11'}
hp-setup[4130]: debug: ***
hp-setup[4130]: debug: [('drv:///hp/hpcups.drv/hp-laserjet_mfp_m28-m31.ppd', 'HP LaserJet MFP m28-m31, hpcups 3.20.11'), ('lsb/usr/HP/hp-laserjet_mfp_m28-m31.ppd.gz', 'HP LaserJet MFP m28-m31, hpcups 3.20.11')]
hp-setup[4130]: debug: Found match: drv:///hp/hpcups.drv/hp-laserjet_mfp_m28-m31.ppd
hp-setup[4130]: debug: Found match: lsb/usr/HP/hp-laserjet_mfp_m28-m31.ppd.gz
hp-setup[4130]: debug: [('drv:///hp/hpcups.drv/hp-laserjet_mfp_m28-m31.ppd', ['m31']), ('lsb/usr/HP/hp-laserjet_mfp_m28-m31.ppd.gz', ['m31'])]
hp-setup[4130]: debug: 2 matches found. Searching based on PDL: Host > PS,PDF > PCL/Other
hp-setup[4130]: debug: Selecting '-m31' PPD: drv:///hp/hpcups.drv/hp-laserjet_mfp_m28-m31.ppd

Found PPD file: drv:///hp/hpcups.drv/hp-laserjet_mfp_m28-m31.ppd
Description: 

Adding print queue to CUPS:
Device URI: hp:/usb/HP_LaserJet_MFP_M28-M31?serial=VNC4K95154
Queue name: HP_LaserJet_MFP_M28-M31
PPD file: drv:///hp/hpcups.drv/hp-laserjet_mfp_m28-m31.ppd
Location: 
Information: HP LaserJet MFP M28-M31 Device (Automatically setup by HPLIP)
hp-setup[4130]: debug: addPrinter('HP_LaserJet_MFP_M28-M31', 'hp:/usb/HP_LaserJet_MFP_M28-M31?serial=VNC4K95154', '', '', 'drv:///hp/hpcups.drv/hp-laserjet_mfp_m28-m31.ppd', 'HP LaserJet MFP M28-M31 Device (Automatically setup by HPLIP)')
hp-setup[4130]: debug: addPrinter() returned (0, successful-ok)
hp-setup[4130]: debug: Exception: 4 (Unknown/invalid device-uri field)
hp-setup[4130]: debug: {'hp:/usb/HP_LaserJet_MFP_M28-M31?serial=VNC4K95154': ['HP_LaserJet_MFP_M28-M31']}
hp-setup[4130]: debug: send_message() entered
hp-setup[4130]: debug: send_message() returning


---------------------
| PRINTER TEST PAGE |
---------------------


Done.
sophie@sophie-SVE1513B1EW:~$
bon tjs pas de scanner
peut être devrais je retenter l'installation d'ubuntu 18
a la fraîche comme indiqué par grigouille dans un autre post ?
Bonjour,
zaer a écritpeut être devrais je retenter l'installation d'ubuntu 18
Là, je ne sais pas; c'est à toi de voir...

Au #39, on ne voit aucune indication concernant la configuration du scan, faudrait l'avis de @grigouille sur ce point.
Désolé de n'avoir rein d'autre à te suggérer. 🙁

A+