Salut,

Édite en mode "sudo" le fichier¹ :
sudo {ton éditeur} /etc/resolv.conf
Ajoute (copié/collé) :
nameserver 1.1.1.1
nameserver 1.1.0.1
En théorie, Internet est OK.
On vérifie que le paquet qu'on souhaite installer est bien dans la liste :
dpkg -l network-manager
Dapès la DOC -------> ICI
sudo  dpkg -i --force-overwrite network-manager.deb
Une fois l'opération terminée ; tu devrais pourvoir relancer :
sudo service network-manager start
Bonne chance 🙂

¹) exemple avec un distrib Xubuntu :
sudo mousepad /etc/resolv.conf
Je sais pas quel éditeur je dois mettre 🙁
Agram a écritJe sais pas quel éditeur je dois mettre 🙁
Surtout...exploiter, profiter, abuser de la documentation accessible en haut à droite ! 🙂
Choisis LA en fonction de ta distribution.

@+
je suis bloquée à cette étape :
uti@uti-Latitude-E5430-non-vPro:~$ dpkg -l network-manager
Souhait=inconnU/Installé/suppRimé/Purgé/H=à garder
| État=Non/Installé/fichier-Config/dépaqUeté/échec-conFig/H=semi-installé/W=att>
|/ Err?=(aucune)/besoin Réinstallation (État,Err: majuscule=mauvais)
||/ Nom             Version         Architecture Description
+++-===============-===============-============-==============================>
ii  network-manager 1.26.2-1ubuntu1 amd64        network management framework (>
lines 1-6/6 (END)
Ben, la commande a bien renvoyé l'info.
On a même l'info que le "deamon" est cassé

Que renvoie la commande :
sudo  dpkg -i --force-overwrite network-manager.deb
J'avoue que je suis pas un spécialiste des dépôts Debian, mais on devrait y arriver 😃
C'est un dépôt Debian ? Pourtant je suis sur Ubuntu :/ Est-ce que le fait d'avoir Ubuntu Mate ça change quelque chose ?
uti@uti-Latitude-E5430-non-vPro:~$ sudo  dpkg -i --force-overwrite network-manager.deb
[sudo] Mot de passe de uti : 
dpkg: erreur: cannot access archive 'network-manager.deb': Aucun fichier ou dossier de ce type
uti@uti-Latitude-E5430-non-vPro:~$ 
Bonjour,

Ah, ouais !
On a pas la même version. Je suis sous Xubuntu et ma version de network-manager est :
network-manager 1.22.10-1ubuntu2.2 amd64        network management framework (daemon and userspace tools)
Ubuntu est basé sur Debian. Idem pour ta version 🙂
Il faut que tu télécharges le paquet
1. Depuis cette adresse : packages.ubuntu.com
2. Sélectionner l'architecture "AMD64"
3. Choisir ton serveur pour télécharger le paquet Ubuntu...
* Exemple avec : fr.archive.ubuntu.com/ubuntu

Merci en retour d'indiquer le dossier(répertoire) ou se trouve ton fichier téléchargé 🙂
Exemple de retour pour toi :
/home/uti-Latitude-E5430-non-vPro/Téléchargements/network-manager_1.26.2-1ubuntu1_amd64.deb
Ou en reprenant l'exemple du dessus ; installe le paquet téléchargé :
cd ~/Téléchargements/
Puis
sudo  dpkg -i --force-overwrite network-manager_1.26.2-1ubuntu1_amd64.deb
Si j'ai pas écrit des conneries bêtises, tu ne devrais pas avoir de message d'erreur !

Bonne chance 🙂
ça ne marche pas ... en fait je suis nulle en commandes, alors je sais pas ce que je doit changer pour trouver network manager, parce qu'en fait quand j'ai voulu le télécharger ça m'a dit qu'il y était déjà.
Bonjour,

Montre d'éventuels paquets cassés :
dpkg -l | grep -v ^ii
uti@uti-Latitude-E5430-non-vPro:~$ 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  bogofilter                                    1.2.4+dfsg1-13build1                 amd64        fast Bayesian spam filter (meta package)
rc  bogofilter-bdb                                1.2.4+dfsg1-13build1                 amd64        fast Bayesian spam filter (Berkeley DB)
rc  bogofilter-common                             1.2.4+dfsg1-13build1                 amd64        fast Bayesian spam filter (common files)
rc  clementine                                    1.3.1+git609-g623a53681+dfsg-1build1 amd64        modern music player and library organizer
rc  evolution                                     3.38.1-1                             amd64        groupware suite with mail client and organizer
rc  fwupdate-signed                               1.19bionic2+12-3bionic2              amd64        Linux Firmware Updater EFI signed binary
rc  gconf2-common                                 3.2.6-5ubuntu1                       all          GNOME configuration database system (common files)
rc  ibus                                          1.5.22-2ubuntu2.1                    amd64        Intelligent Input Bus - core
rc  indicator-bluetooth                           0.0.6+17.10.20170605-0ubuntu3        amd64        System bluetooth indicator.
rc  indicator-keyboard                            0.0.0+19.10.20190716-0ubuntu2        amd64        Keyboard indicator
rc  indicator-session                             17.3.20+19.10.20190921-0ubuntu1      amd64        indicator showing session management, status and user switching
rc  kdeconnect                                    1.4-0ubuntu5                         amd64        connect smartphones to your desktop devices.
rc  libgdata2.1-cil                               2.2.0.0-2build1                      all          Google GData CLI client library
rc  libglib2.0-cil                                2.12.40-2                            amd64        CLI binding for the GLib utility library 2.12
rc  libgtk2.0-cil                                 2.12.40-2                            amd64        CLI binding for the GTK+ toolkit 2.12
rc  libnewtonsoft-json5.0-cil                     6.0.8+dfsg-1                         all          high-performance JSON framework for .NET
rc  libpython3.7-minimal:amd64                    3.7.5-2~19.10ubuntu1                 amd64        Minimal subset of the Python language (version 3.7)
rc  libqjson0:amd64                               0.8.1-3                              amd64        Qt-based library that maps JSON data to QVariant objects
rc  libqtcore4:amd64                              4:4.8.7+dfsg-7ubuntu3                amd64        Qt 4 core module
rc  libsensors4:amd64                             1:3.4.0-4                            amd64        library to read temperature/voltage/fan sensors
rc  libwildmidi-config                            0.4.3-1                              all          software MIDI player configuration
rc  libwireshark-data                             3.0.5-1                              all          network packet dissection library -- data files
rc  linux-image-4.15.0-29-generic                 4.15.0-29.31                         amd64        Signed kernel image generic
rc  linux-image-4.15.0-45-generic                 4.15.0-45.48                         amd64        Signed kernel image generic
rc  linux-image-4.15.0-47-generic                 4.15.0-47.50                         amd64        Signed kernel image generic
rc  linux-image-4.15.0-48-generic                 4.15.0-48.51                         amd64        Signed kernel image generic
rc  linux-image-4.15.0-50-generic                 4.15.0-50.54                         amd64        Signed kernel image generic
rc  linux-image-4.15.0-51-generic                 4.15.0-51.55                         amd64        Signed kernel image generic
rc  linux-image-4.15.0-55-generic                 4.15.0-55.60                         amd64        Signed kernel image generic
rc  linux-image-5.0.0-21-generic                  5.0.0-21.22                          amd64        Signed kernel image generic
rc  linux-image-5.0.0-25-generic                  5.0.0-25.26                          amd64        Signed kernel image generic
rc  linux-image-5.0.0-27-generic                  5.0.0-27.28                          amd64        Signed kernel image generic
rc  linux-image-5.0.0-29-generic                  5.0.0-29.31                          amd64        Signed kernel image generic
rc  linux-image-5.0.0-31-generic                  5.0.0-31.33                          amd64        Signed kernel image generic
rc  linux-image-5.0.0-36-generic                  5.0.0-36.39                          amd64        Signed kernel image generic
rc  linux-image-5.0.0-37-generic                  5.0.0-37.40                          amd64        Signed kernel image generic
rc  linux-image-5.3.0-24-generic                  5.3.0-24.26                          amd64        Signed kernel image generic
rc  linux-image-5.3.0-26-generic                  5.3.0-26.28                          amd64        Signed kernel image generic
rc  linux-image-5.3.0-29-generic                  5.3.0-29.31                          amd64        Signed kernel image generic
rc  linux-image-5.3.0-40-generic                  5.3.0-40.32                          amd64        Signed kernel image generic
rc  linux-image-5.3.0-42-generic                  5.3.0-42.34                          amd64        Signed kernel image generic
rc  linux-image-5.3.0-45-generic                  5.3.0-45.37                          amd64        Signed kernel image generic
rc  linux-image-5.3.0-46-generic                  5.3.0-46.38                          amd64        Signed kernel image generic
rc  linux-image-5.4.0-26-generic                  5.4.0-26.30                          amd64        Signed kernel image generic
rc  linux-image-5.4.0-28-generic                  5.4.0-28.32                          amd64        Signed kernel image generic
rc  linux-image-5.4.0-29-generic                  5.4.0-29.33                          amd64        Signed kernel image generic
rc  linux-image-5.4.0-31-generic                  5.4.0-31.35                          amd64        Signed kernel image generic
rc  linux-image-5.4.0-33-generic                  5.4.0-33.37                          amd64        Signed kernel image generic
rc  linux-image-5.4.0-37-generic                  5.4.0-37.41                          amd64        Signed kernel image generic
rc  linux-image-5.4.0-39-generic                  5.4.0-39.43                          amd64        Signed kernel image generic
rc  linux-image-5.4.0-40-generic                  5.4.0-40.44                          amd64        Signed kernel image generic
rc  linux-image-5.4.0-42-generic                  5.4.0-42.46                          amd64        Signed kernel image generic
rc  linux-image-5.4.0-45-generic                  5.4.0-45.49                          amd64        Signed kernel image generic
rc  linux-image-5.4.0-47-generic                  5.4.0-47.51                          amd64        Signed kernel image generic
rc  linux-image-5.4.0-48-generic                  5.4.0-48.52                          amd64        Signed kernel image generic
rc  linux-image-5.4.0-51-generic                  5.4.0-51.56                          amd64        Signed kernel image generic
rc  linux-image-5.4.0-52-generic                  5.4.0-52.57                          amd64        Signed kernel image generic
rc  linux-image-5.8.0-25-generic                  5.8.0-25.26                          amd64        Signed kernel image generic
rc  linux-image-5.8.0-26-generic                  5.8.0-26.27                          amd64        Signed kernel image generic
rc  linux-image-5.8.0-28-generic                  5.8.0-28.30                          amd64        Signed kernel image generic
rc  linux-image-5.8.0-29-generic                  5.8.0-29.31                          amd64        Signed kernel image generic
rc  linux-modules-4.15.0-29-generic               4.15.0-29.31                         amd64        Linux kernel extra modules for version 4.15.0 on 64 bit x86 SMP
rc  linux-modules-4.15.0-45-generic               4.15.0-45.48                         amd64        Linux kernel extra modules for version 4.15.0 on 64 bit x86 SMP
rc  linux-modules-4.15.0-47-generic               4.15.0-47.50                         amd64        Linux kernel extra modules for version 4.15.0 on 64 bit x86 SMP
rc  linux-modules-4.15.0-48-generic               4.15.0-48.51                         amd64        Linux kernel extra modules for version 4.15.0 on 64 bit x86 SMP
rc  linux-modules-4.15.0-50-generic               4.15.0-50.54                         amd64        Linux kernel extra modules for version 4.15.0 on 64 bit x86 SMP
rc  linux-modules-4.15.0-51-generic               4.15.0-51.55                         amd64        Linux kernel extra modules for version 4.15.0 on 64 bit x86 SMP
rc  linux-modules-4.15.0-55-generic               4.15.0-55.60                         amd64        Linux kernel extra modules for version 4.15.0 on 64 bit x86 SMP
rc  linux-modules-5.0.0-21-generic                5.0.0-21.22                          amd64        Linux kernel extra modules for version 5.0.0 on 64 bit x86 SMP
rc  linux-modules-5.0.0-25-generic                5.0.0-25.26                          amd64        Linux kernel extra modules for version 5.0.0 on 64 bit x86 SMP
rc  linux-modules-5.0.0-27-generic                5.0.0-27.28                          amd64        Linux kernel extra modules for version 5.0.0 on 64 bit x86 SMP
rc  linux-modules-5.0.0-29-generic                5.0.0-29.31                          amd64        Linux kernel extra modules for version 5.0.0 on 64 bit x86 SMP
rc  linux-modules-5.0.0-31-generic                5.0.0-31.33                          amd64        Linux kernel extra modules for version 5.0.0 on 64 bit x86 SMP
rc  linux-modules-5.0.0-32-generic                5.0.0-32.34                          amd64        Linux kernel extra modules for version 5.0.0 on 64 bit x86 SMP
rc  linux-modules-5.0.0-36-generic                5.0.0-36.39                          amd64        Linux kernel extra modules for version 5.0.0 on 64 bit x86 SMP
rc  linux-modules-5.0.0-37-generic                5.0.0-37.40                          amd64        Linux kernel extra modules for version 5.0.0 on 64 bit x86 SMP
rc  linux-modules-5.3.0-24-generic                5.3.0-24.26                          amd64        Linux kernel extra modules for version 5.3.0 on 64 bit x86 SMP
rc  linux-modules-5.3.0-26-generic                5.3.0-26.28                          amd64        Linux kernel extra modules for version 5.3.0 on 64 bit x86 SMP
rc  linux-modules-5.3.0-29-generic                5.3.0-29.31                          amd64        Linux kernel extra modules for version 5.3.0 on 64 bit x86 SMP
rc  linux-modules-5.3.0-40-generic                5.3.0-40.32                          amd64        Linux kernel extra modules for version 5.3.0 on 64 bit x86 SMP
rc  linux-modules-5.3.0-42-generic                5.3.0-42.34                          amd64        Linux kernel extra modules for version 5.3.0 on 64 bit x86 SMP
rc  linux-modules-5.3.0-45-generic                5.3.0-45.37                          amd64        Linux kernel extra modules for version 5.3.0 on 64 bit x86 SMP
rc  linux-modules-5.3.0-46-generic                5.3.0-46.38                          amd64        Linux kernel extra modules for version 5.3.0 on 64 bit x86 SMP
rc  linux-modules-5.4.0-26-generic                5.4.0-26.30                          amd64        Linux kernel extra modules for version 5.4.0 on 64 bit x86 SMP
rc  linux-modules-5.4.0-28-generic                5.4.0-28.32                          amd64        Linux kernel extra modules for version 5.4.0 on 64 bit x86 SMP
rc  linux-modules-5.4.0-29-generic                5.4.0-29.33                          amd64        Linux kernel extra modules for version 5.4.0 on 64 bit x86 SMP
rc  linux-modules-5.4.0-31-generic                5.4.0-31.35                          amd64        Linux kernel extra modules for version 5.4.0 on 64 bit x86 SMP
rc  linux-modules-5.4.0-33-generic                5.4.0-33.37                          amd64        Linux kernel extra modules for version 5.4.0 on 64 bit x86 SMP
rc  linux-modules-5.4.0-37-generic                5.4.0-37.41                          amd64        Linux kernel extra modules for version 5.4.0 on 64 bit x86 SMP
rc  linux-modules-5.4.0-39-generic                5.4.0-39.43                          amd64        Linux kernel extra modules for version 5.4.0 on 64 bit x86 SMP
rc  linux-modules-5.4.0-40-generic                5.4.0-40.44                          amd64        Linux kernel extra modules for version 5.4.0 on 64 bit x86 SMP
rc  linux-modules-5.4.0-42-generic                5.4.0-42.46                          amd64        Linux kernel extra modules for version 5.4.0 on 64 bit x86 SMP
rc  linux-modules-5.4.0-45-generic                5.4.0-45.49                          amd64        Linux kernel extra modules for version 5.4.0 on 64 bit x86 SMP
rc  linux-modules-5.4.0-47-generic                5.4.0-47.51                          amd64        Linux kernel extra modules for version 5.4.0 on 64 bit x86 SMP
rc  linux-modules-5.4.0-48-generic                5.4.0-48.52                          amd64        Linux kernel extra modules for version 5.4.0 on 64 bit x86 SMP
rc  linux-modules-5.4.0-51-generic                5.4.0-51.56                          amd64        Linux kernel extra modules for version 5.4.0 on 64 bit x86 SMP
rc  linux-modules-5.4.0-52-generic                5.4.0-52.57                          amd64        Linux kernel extra modules for version 5.4.0 on 64 bit x86 SMP
rc  linux-modules-5.8.0-25-generic                5.8.0-25.26                          amd64        Linux kernel extra modules for version 5.8.0 on 64 bit x86 SMP
rc  linux-modules-5.8.0-26-generic                5.8.0-26.27                          amd64        Linux kernel extra modules for version 5.8.0 on 64 bit x86 SMP
rc  linux-modules-5.8.0-28-generic                5.8.0-28.30                          amd64        Linux kernel extra modules for version 5.8.0 on 64 bit x86 SMP
rc  linux-modules-5.8.0-29-generic                5.8.0-29.31                          amd64        Linux kernel extra modules for version 5.8.0 on 64 bit x86 SMP
rc  linux-modules-extra-4.15.0-29-generic         4.15.0-29.31                         amd64        Linux kernel extra modules for version 4.15.0 on 64 bit x86 SMP
rc  linux-modules-extra-4.15.0-45-generic         4.15.0-45.48                         amd64        Linux kernel extra modules for version 4.15.0 on 64 bit x86 SMP
rc  linux-modules-extra-4.15.0-47-generic         4.15.0-47.50                         amd64        Linux kernel extra modules for version 4.15.0 on 64 bit x86 SMP
rc  linux-modules-extra-4.15.0-48-generic         4.15.0-48.51                         amd64        Linux kernel extra modules for version 4.15.0 on 64 bit x86 SMP
rc  linux-modules-extra-4.15.0-50-generic         4.15.0-50.54                         amd64        Linux kernel extra modules for version 4.15.0 on 64 bit x86 SMP
rc  linux-modules-extra-4.15.0-51-generic         4.15.0-51.55                         amd64        Linux kernel extra modules for version 4.15.0 on 64 bit x86 SMP
rc  linux-modules-extra-4.15.0-55-generic         4.15.0-55.60                         amd64        Linux kernel extra modules for version 4.15.0 on 64 bit x86 SMP
rc  linux-modules-extra-5.0.0-21-generic          5.0.0-21.22                          amd64        Linux kernel extra modules for version 5.0.0 on 64 bit x86 SMP
rc  linux-modules-extra-5.0.0-25-generic          5.0.0-25.26                          amd64        Linux kernel extra modules for version 5.0.0 on 64 bit x86 SMP
rc  linux-modules-extra-5.0.0-27-generic          5.0.0-27.28                          amd64        Linux kernel extra modules for version 5.0.0 on 64 bit x86 SMP
rc  linux-modules-extra-5.0.0-29-generic          5.0.0-29.31                          amd64        Linux kernel extra modules for version 5.0.0 on 64 bit x86 SMP
rc  linux-modules-extra-5.0.0-31-generic          5.0.0-31.33                          amd64        Linux kernel extra modules for version 5.0.0 on 64 bit x86 SMP
rc  linux-modules-extra-5.0.0-32-generic          5.0.0-32.34                          amd64        Linux kernel extra modules for version 5.0.0 on 64 bit x86 SMP
rc  linux-modules-extra-5.0.0-36-generic          5.0.0-36.39                          amd64        Linux kernel extra modules for version 5.0.0 on 64 bit x86 SMP
rc  linux-modules-extra-5.0.0-37-generic          5.0.0-37.40                          amd64        Linux kernel extra modules for version 5.0.0 on 64 bit x86 SMP
rc  linux-modules-extra-5.3.0-24-generic          5.3.0-24.26                          amd64        Linux kernel extra modules for version 5.3.0 on 64 bit x86 SMP
rc  linux-modules-extra-5.3.0-26-generic          5.3.0-26.28                          amd64        Linux kernel extra modules for version 5.3.0 on 64 bit x86 SMP
rc  linux-modules-extra-5.3.0-29-generic          5.3.0-29.31                          amd64        Linux kernel extra modules for version 5.3.0 on 64 bit x86 SMP
rc  linux-modules-extra-5.3.0-40-generic          5.3.0-40.32                          amd64        Linux kernel extra modules for version 5.3.0 on 64 bit x86 SMP
rc  linux-modules-extra-5.3.0-42-generic          5.3.0-42.34                          amd64        Linux kernel extra modules for version 5.3.0 on 64 bit x86 SMP
rc  linux-modules-extra-5.3.0-45-generic          5.3.0-45.37                          amd64        Linux kernel extra modules for version 5.3.0 on 64 bit x86 SMP
rc  linux-modules-extra-5.3.0-46-generic          5.3.0-46.38                          amd64        Linux kernel extra modules for version 5.3.0 on 64 bit x86 SMP
rc  linux-modules-extra-5.4.0-26-generic          5.4.0-26.30                          amd64        Linux kernel extra modules for version 5.4.0 on 64 bit x86 SMP
rc  linux-modules-extra-5.4.0-28-generic          5.4.0-28.32                          amd64        Linux kernel extra modules for version 5.4.0 on 64 bit x86 SMP
rc  linux-modules-extra-5.4.0-29-generic          5.4.0-29.33                          amd64        Linux kernel extra modules for version 5.4.0 on 64 bit x86 SMP
rc  linux-modules-extra-5.4.0-31-generic          5.4.0-31.35                          amd64        Linux kernel extra modules for version 5.4.0 on 64 bit x86 SMP
rc  linux-modules-extra-5.4.0-33-generic          5.4.0-33.37                          amd64        Linux kernel extra modules for version 5.4.0 on 64 bit x86 SMP
rc  linux-modules-extra-5.4.0-37-generic          5.4.0-37.41                          amd64        Linux kernel extra modules for version 5.4.0 on 64 bit x86 SMP
rc  linux-modules-extra-5.4.0-39-generic          5.4.0-39.43                          amd64        Linux kernel extra modules for version 5.4.0 on 64 bit x86 SMP
rc  linux-modules-extra-5.4.0-40-generic          5.4.0-40.44                          amd64        Linux kernel extra modules for version 5.4.0 on 64 bit x86 SMP
rc  linux-modules-extra-5.4.0-42-generic          5.4.0-42.46                          amd64        Linux kernel extra modules for version 5.4.0 on 64 bit x86 SMP
rc  linux-modules-extra-5.4.0-45-generic          5.4.0-45.49                          amd64        Linux kernel extra modules for version 5.4.0 on 64 bit x86 SMP
rc  linux-modules-extra-5.4.0-47-generic          5.4.0-47.51                          amd64        Linux kernel extra modules for version 5.4.0 on 64 bit x86 SMP
rc  linux-modules-extra-5.4.0-48-generic          5.4.0-48.52                          amd64        Linux kernel extra modules for version 5.4.0 on 64 bit x86 SMP
rc  linux-modules-extra-5.4.0-51-generic          5.4.0-51.56                          amd64        Linux kernel extra modules for version 5.4.0 on 64 bit x86 SMP
rc  linux-modules-extra-5.4.0-52-generic          5.4.0-52.57                          amd64        Linux kernel extra modules for version 5.4.0 on 64 bit x86 SMP
rc  linux-modules-extra-5.8.0-25-generic          5.8.0-25.26                          amd64        Linux kernel extra modules for version 5.8.0 on 64 bit x86 SMP
rc  linux-modules-extra-5.8.0-26-generic          5.8.0-26.27                          amd64        Linux kernel extra modules for version 5.8.0 on 64 bit x86 SMP
rc  linux-modules-extra-5.8.0-28-generic          5.8.0-28.30                          amd64        Linux kernel extra modules for version 5.8.0 on 64 bit x86 SMP
rc  linux-modules-extra-5.8.0-29-generic          5.8.0-29.31                          amd64        Linux kernel extra modules for version 5.8.0 on 64 bit x86 SMP
rc  netsurf-gtk                                   3.6-3.2                              amd64        small web browser with CSS support for GTK
rc  parcellite                                    1.2.1-2                              amd64        lightweight GTK+ clipboard manager
rc  python                                        2.7.17-1                             amd64        interactive high-level object-oriented language (Python2 version)
rc  python-pygments                               2.3.1+dfsg-1ubuntu2                  all          syntax highlighting package written in Python
rc  python3.7-minimal                             3.7.5-2~19.10ubuntu1                 amd64        Minimal subset of the Python language (version 3.7)
rc  rarian-compat                                 0.8.1-6build1                        amd64        Documentation meta-data library (compatibility tools)
rc  redshift-gtk                                  1.12-2                               all          Adjusts the color temperature of your screen with GTK+ integration
rc  sni-qt:amd64                                  0.2.7+17.04.20170112-0ubuntu1        amd64        indicator support for Qt
rc  ubuntu-system-service                         0.7                                  all          Dbus service to set various system-wide configurations
rc  unity-control-center                          15.04.0+19.04.20190209-0ubuntu3      amd64        utilities to configure the GNOME desktop
rc  veracrypt                                     1.23-0vanir1~18.04                   amd64        Cross-platform on-the-fly encryption
rc  wireshark-common                              3.0.5-1                              amd64        network traffic analyzer - common files
rc  zeitgeist-core                                1.0.2-0ubuntu1                       amd64        event logging framework - engine
rc  zoom                                          3.5.374815.0324                      amd64        Zoom, #1 Video Conferencing and Web Conferencing Service 
uti@uti-Latitude-E5430-non-vPro:~$ 
Pour nettoyer :
Le 11/02/2017, moko138 a écritPour supprimer tous ces fichiers de configuration devenus sans objets et marqués "rc", et uniquement ces fichiers, exécute :
dpkg -l | awk '/^rc/{print $2}' | xargs -r sudo dpkg -P
Merci, je savais pas que j'avais tout ce bazar à supprimer !
Fournis les noyaux restants :
echo; dpkg -l | awk '!/^rc/ && / linux-(c|g|h|i|lo|m|si|t)/{print $1,$2,$3,$4 | "sort -k3V | column -t"}' ; echo -e "\nNoyau courant : $(uname -mr)"
uti@uti-Latitude-E5430-non-vPro:~$ echo; dpkg -l | awk '!/^rc/ && / linux-(c|g|h|i|lo|m|si|t)/{print $1,$2,$3,$4 | "sort -k3V | column -t"}' ; echo -e "\nNoyau courant : $(uname -mr)"

ii  linux-headers-5.8.0-31                5.8.0-31.33  all
ii  linux-headers-5.8.0-31-generic        5.8.0-31.33  amd64
ii  linux-image-5.8.0-31-generic          5.8.0-31.33  amd64
ii  linux-modules-5.8.0-31-generic        5.8.0-31.33  amd64
ii  linux-modules-extra-5.8.0-31-generic  5.8.0-31.33  amd64
ii  linux-headers-5.8.0-33                5.8.0-33.36  all
ii  linux-headers-5.8.0-33-generic        5.8.0-33.36  amd64
ii  linux-image-5.8.0-33-generic          5.8.0-33.36  amd64
ii  linux-modules-5.8.0-33-generic        5.8.0-33.36  amd64
ii  linux-modules-extra-5.8.0-33-generic  5.8.0-33.36  amd64
ii  linux-generic                         5.8.0.33.38  amd64
ii  linux-headers-generic                 5.8.0.33.38  amd64
ii  linux-image-generic                   5.8.0.33.38  amd64

Noyau courant : 5.8.0-33-generic x86_64
uti@uti-Latitude-E5430-non-vPro:~$ 
Agram a écritça ne marche pas ...
Pour avoir de l'aide c'est de donner en retour le message d'erreur 🙂
Agram a écriten fait je suis nulle en commandes,
Ben non !
Tu communiques très bien avec @xubu1957 ! 😃
Agram a écritalors je sais pas ce que je doit changer pour trouver network manager, parce qu'en fait quand j'ai voulu le télécharger ça m'a dit qu'il y était déjà.
Ma réponse est sans doute pas clair pour toi !
(Bon, j'avoue... Je suis du 9-3, au chômage, black, musulman, homosexuel, sidaïque, fiché S & je sors de prison... le dialogue est un « handicap ? » :lol: )
Pour avoir de l'aide c'est de préciser ou est mon erreur ou blocage et de donner en retour le message d'erreur 🙂

Questions :
* Tu as déjà téléchargé le fichier : network-manager_1.26.2-1ubuntu1_amd64.deb ?
* Dans quel dossier se trouve le fichier : network-manager_1.26.2-1ubuntu1_amd64.deb ?

@+
Oui network manager est déjà installé, l'installateur de paquet me dit que la même version est déjà installée, et dans l'installateur, sur Lintian ouput (première fois que je vois ça, aucune idée ce que ça veut dire) ça dit :
W: network-manager: dbus-policy-without-send-destination usr/share/dbus-1/system.d/org.freedesktop.NetworkManager.conf <policy user="root"><deny send_interface="..." />
W: network-manager: dbus-policy-without-send-destination usr/share/dbus-1/system.d/org.freedesktop.NetworkManager.conf <policy user="root"><deny send_interface="..." />
W: network-manager: groff-message usr/share/man/man5/nm-settings-dbus.5.gz 121: warning [p 1, 8.0i, div '3tbd3,0', 0.0i]: can't break line
W: network-manager: groff-message usr/share/man/man5/nm-settings-keyfile.5.gz 253: warning [p 3, 5.7i, div '3tbd1,2', 0.2i]: can't break line

Lintian finished with exit status 0
Est-ce que c'est utile ? :/
Salut et merci pour le retour 🙂

On va vérifier deux choses windscribe et un fichier de Network Manager :
1. Édite avec ton éditeur le fichier suivant :
sudo {Ton éditeur] /etc/apt/sources.list
Supprime toutes les lignes contenant "windscribe ". En théorie deux lignes, exemple :
windscribe-repo.list
windscribe-repo.list.distUpgrade
2. Merci de donner le retour de :
cat /usr/share/dbus-1/system.d/org.freedesktop.NetworkManager.conf
(c'est assez long 🙂 )

@+
J'ai essayé avec Pluma, je pensais que c'est l'éditeur que j'ai, mais ça me dit ça :
-MATE 18.04.1 LTS _Bionic Beaver_ - Release amd64 (20180725)]/ bionic main multiverse restricted universe

# See http://help.ubuntu.com/community/UpgradeNotes for how to upgrade to
# newer versions of the distribution.
deb http://fr.archive.ubuntu.com/ubuntu/ groovy restricted main
deb-src http://fr.archive.ubuntu.com/ubuntu/ groovy main universe multiverse restricted #Added by software-properties
deb-src http://de.archive.ubuntu.com/ubuntu/ bionic main restricted

## Major bug fix updates produced after the final release of the
## distribution.
deb http://fr.archive.ubuntu.com/ubuntu/ groovy-updates restricted main
deb-src http://fr.archive.ubuntu.com/ubuntu/ groovy-updates main universe multiverse restricted #Added by software-properties
deb-src http://de.archive.ubuntu.com/ubuntu/ bionic-updates main restricted

## N.B. software from this repository is ENTIRELY UNSUPPORTED by the Ubuntu
## team. Also, please note that software in universe WILL NOT receive any
## review or updates from the Ubuntu security team.
deb http://fr.archive.ubuntu.com/ubuntu/ groovy universe
deb-src http://de.archive.ubuntu.com/ubuntu/ bionic universe
deb http://fr.archive.ubuntu.com/ubuntu/ groovy-updates universe
deb-src http://de.archive.ubuntu.com/ubuntu/ bionic-updates universe

## N.B. software from this repository is ENTIRELY UNSUPPORTED by the Ubuntu 
## team, and may not be under a free licence. Please satisfy yourself as to 
## your rights to use the software. Also, please note that software in 
## multiverse WILL NOT receive any review or updates from the Ubuntu
## security team.
deb http://fr.archive.ubuntu.com/ubuntu/ groovy multiverse
deb-src http://de.archive.ubuntu.com/ubuntu/ bionic multiverse
deb http://fr.archive.ubuntu.com/ubuntu/ groovy-updates multiverse
deb-src http://de.archive.ubuntu.com/ubuntu/ bionic-updates multiverse

## N.B. software from this repository may not have been tested as
## extensively as that contained in the main release, although it includes
## newer versions of some applications which may provide useful features.
## Also, please note that software in backports WILL NOT receive any review
## or updates from the Ubuntu security team.
deb http://fr.archive.ubuntu.com/ubuntu/ groovy-backports restricted universe multiverse main
deb-src http://fr.archive.ubuntu.com/ubuntu/ groovy-backports restricted universe multiverse main #Added by software-properties
# deb-src http://de.archive.ubuntu.com/ubuntu/ bionic-backports main restricted universe multiverse

## Uncomment the following two lines to add software from Canonical's
## 'partner' repository.
## This software is not part of Ubuntu, but is offered by Canonical and the
## respective vendors as a service to Ubuntu users.
deb http://archive.canonical.com/ubuntu groovy partner
deb-src http://archive.canonical.com/ubuntu groovy partner

deb http://fr.archive.ubuntu.com/ubuntu/ groovy-security restricted main
deb-src http://fr.archive.ubuntu.com/ubuntu/ groovy-security main universe multiverse restricted #Added by software-properties
deb-src http://security.ubuntu.com/ubuntu bionic-security main restricted
deb http://fr.archive.ubuntu.com/ubuntu/ groovy-security universe
deb-src http://security.ubuntu.com/ubuntu bionic-security universe
deb http://fr.archive.ubuntu.com/ubuntu/ groovy-security multiverse
deb-src http://security.ubuntu.com/ubuntu bionic-security multiverse
Donc rien au sujet de windscribe.
Et le retour que tu demandais :
uti@uti-Latitude-E5430-non-vPro:~$ cat /usr/share/dbus-1/system.d/org.freedesktop.NetworkManager.conf
<!DOCTYPE busconfig PUBLIC
 "-//freedesktop//DTD D-BUS Bus Configuration 1.0//EN"
 "http://www.freedesktop.org/standards/dbus/1.0/busconfig.dtd">
<busconfig>
    <policy user="root">
        <allow own="org.freedesktop.NetworkManager"/>
        <allow send_destination="org.freedesktop.NetworkManager"/>

        <allow send_destination="org.freedesktop.NetworkManager"
               send_interface="org.freedesktop.NetworkManager.PPP"/>

        <allow send_interface="org.freedesktop.NetworkManager.SecretAgent"/>

        <!-- These are there because some broken policies do
             <deny send_interface="..." /> (see dbus-daemon(8) for details).
             This seems to override that for the known VPN plugins.
          -->
        <allow send_destination="org.freedesktop.NetworkManager.openconnect"/>
        <allow send_destination="org.freedesktop.NetworkManager.openswan"/>
        <allow send_destination="org.freedesktop.NetworkManager.openvpn"/>
        <allow send_destination="org.freedesktop.NetworkManager.pptp"/>
        <allow send_destination="org.freedesktop.NetworkManager.vpnc"/>
        <allow send_destination="org.freedesktop.NetworkManager.ssh"/>
        <allow send_destination="org.freedesktop.NetworkManager.iodine"/>
        <allow send_destination="org.freedesktop.NetworkManager.l2tp"/>
        <allow send_destination="org.freedesktop.NetworkManager.libreswan"/>
        <allow send_destination="org.freedesktop.NetworkManager.fortisslvpn"/>
        <allow send_destination="org.freedesktop.NetworkManager.strongswan"/>
        <allow send_interface="org.freedesktop.NetworkManager.VPN.Plugin"/>

        <allow send_destination="org.fedoraproject.FirewallD1"/>

        <!-- Allow the custom name for the dnsmasq instance spawned by NM
             from the dns dnsmasq plugin to own its dbus name, and for
             messages to be sent to it.
         -->
        <allow own="org.freedesktop.NetworkManager.dnsmasq"/>
        <allow send_destination="org.freedesktop.NetworkManager.dnsmasq"/>
    </policy>
    <policy user="whoopsie">
            <allow send_destination="org.freedesktop.NetworkManager"/>
            <allow send_destination="org.freedesktop.NetworkManager"
                   send_interface="org.freedesktop.DBus.Introspectable"/>
            <allow send_destination="org.freedesktop.NetworkManager"
                   send_interface="org.freedesktop.DBus.Properties"/>
            <allow send_destination="org.freedesktop.NetworkManager"
                   send_interface="org.freedesktop.NetworkManager"/>
            <allow send_destination="org.freedesktop.NetworkManager"
                   send_interface="org.freedesktop.NetworkManager.Connection.Active"/>
            <allow send_destination="org.freedesktop.NetworkManager"
                   send_interface="org.freedesktop.NetworkManager.Device"/>
    </policy>
    <policy context="default">
        <deny own="org.freedesktop.NetworkManager"/>

        <deny send_destination="org.freedesktop.NetworkManager"/>

        <!-- Basic D-Bus API stuff -->
        <allow send_destination="org.freedesktop.NetworkManager"
               send_interface="org.freedesktop.DBus.Introspectable"/>
        <allow send_destination="org.freedesktop.NetworkManager"
               send_interface="org.freedesktop.DBus.Properties"/>
        <allow send_destination="org.freedesktop.NetworkManager"
               send_interface="org.freedesktop.DBus.ObjectManager"/>

        <!-- Devices (read-only properties, no methods) -->
        <allow send_destination="org.freedesktop.NetworkManager" send_interface="org.freedesktop.NetworkManager.AccessPoint"/>
        <allow send_destination="org.freedesktop.NetworkManager" send_interface="org.freedesktop.NetworkManager.Device.Adsl"/>
        <allow send_destination="org.freedesktop.NetworkManager" send_interface="org.freedesktop.NetworkManager.Device.Bluetooth"/>
        <allow send_destination="org.freedesktop.NetworkManager" send_interface="org.freedesktop.NetworkManager.Device.Bond"/>
        <allow send_destination="org.freedesktop.NetworkManager" send_interface="org.freedesktop.NetworkManager.Device.Bridge"/>
        <allow send_destination="org.freedesktop.NetworkManager" send_interface="org.freedesktop.NetworkManager.Device.Generic"/>
        <allow send_destination="org.freedesktop.NetworkManager" send_interface="org.freedesktop.NetworkManager.Device.Gre"/>
        <allow send_destination="org.freedesktop.NetworkManager" send_interface="org.freedesktop.NetworkManager.Device.Infiniband"/>
        <allow send_destination="org.freedesktop.NetworkManager" send_interface="org.freedesktop.NetworkManager.Device.Macvlan"/>
        <allow send_destination="org.freedesktop.NetworkManager" send_interface="org.freedesktop.NetworkManager.Device.Modem"/>
        <allow send_destination="org.freedesktop.NetworkManager" send_interface="org.freedesktop.NetworkManager.Device.OlpcMesh"/>
        <allow send_destination="org.freedesktop.NetworkManager" send_interface="org.freedesktop.NetworkManager.Device.Team"/>
        <allow send_destination="org.freedesktop.NetworkManager" send_interface="org.freedesktop.NetworkManager.Device.Tun"/>
        <allow send_destination="org.freedesktop.NetworkManager" send_interface="org.freedesktop.NetworkManager.Device.Veth"/>
        <allow send_destination="org.freedesktop.NetworkManager" send_interface="org.freedesktop.NetworkManager.Device.Vlan"/>
        <allow send_destination="org.freedesktop.NetworkManager" send_interface="org.freedesktop.NetworkManager.Device.Wired"/>
        <allow send_destination="org.freedesktop.NetworkManager" send_interface="org.freedesktop.NetworkManager.WiMax.Nsp"/>
        <allow send_destination="org.freedesktop.NetworkManager" send_interface="org.freedesktop.NetworkManager.WifiP2PPeer"/>

        <!-- Devices (read-only, no security required) -->
        <allow send_destination="org.freedesktop.NetworkManager" send_interface="org.freedesktop.NetworkManager.Device.WiMax"/>

        <!-- Devices (read/write, secured with PolicyKit) -->
        <allow send_destination="org.freedesktop.NetworkManager" send_interface="org.freedesktop.NetworkManager.Device.Wireless"/>
        <allow send_destination="org.freedesktop.NetworkManager" send_interface="org.freedesktop.NetworkManager.Device.WifiP2P"/>
        <allow send_destination="org.freedesktop.NetworkManager" send_interface="org.freedesktop.NetworkManager.Device"/>

        <!-- Core stuff (read-only properties, no methods) -->
        <allow send_destination="org.freedesktop.NetworkManager" send_interface="org.freedesktop.NetworkManager.Connection.Active"/>
        <allow send_destination="org.freedesktop.NetworkManager" send_interface="org.freedesktop.NetworkManager.DHCP4Config"/>
        <allow send_destination="org.freedesktop.NetworkManager" send_interface="org.freedesktop.NetworkManager.DHCP6Config"/>
        <allow send_destination="org.freedesktop.NetworkManager" send_interface="org.freedesktop.NetworkManager.IP4Config"/>
        <allow send_destination="org.freedesktop.NetworkManager" send_interface="org.freedesktop.NetworkManager.IP6Config"/>
        <allow send_destination="org.freedesktop.NetworkManager" send_interface="org.freedesktop.NetworkManager.VPN.Connection"/>

        <!-- Core stuff (read/write, secured with PolicyKit) -->
        <allow send_destination="org.freedesktop.NetworkManager" send_interface="org.freedesktop.NetworkManager"/>
        <allow send_destination="org.freedesktop.NetworkManager" send_interface="org.freedesktop.NetworkManager.Settings"/>
        <allow send_destination="org.freedesktop.NetworkManager" send_interface="org.freedesktop.NetworkManager.Settings.Connection"/>

        <!-- Agents; secured with PolicyKit.  Any process can talk to
             the AgentManager API, but only NetworkManager can talk
             to the agents themselves. -->
        <allow send_destination="org.freedesktop.NetworkManager" send_interface="org.freedesktop.NetworkManager.AgentManager"/>

        <!-- Root-only functions -->
        <deny send_destination="org.freedesktop.NetworkManager" send_interface="org.freedesktop.NetworkManager"          send_member="SetLogging"/>
        <deny send_destination="org.freedesktop.NetworkManager" send_interface="org.freedesktop.NetworkManager"          send_member="Sleep"/>
        <deny send_destination="org.freedesktop.NetworkManager" send_interface="org.freedesktop.NetworkManager.Settings" send_member="LoadConnections"/>
        <deny send_destination="org.freedesktop.NetworkManager" send_interface="org.freedesktop.NetworkManager.Settings" send_member="ReloadConnections"/>

        <deny own="org.freedesktop.NetworkManager.dnsmasq"/>
        <deny send_destination="org.freedesktop.NetworkManager.dnsmasq"/>
    </policy>

    <limit name="max_replies_per_connection">1024</limit>
    <limit name="max_match_rules_per_connection">2048</limit>
</busconfig>
uti@uti-Latitude-E5430-non-vPro:~$ 
Merci pour les deux retours !
(ton fichier "org.freedesktop.NetworkManager.conf" est identique au mien)

Je suppose que tu as exécuté la commande de @xubu1957 (#14)

@+