yael@Hedont-HP-Stream:~$ dpkg -l | grep blue
ii  bluez                                      5.53-0ubuntu3                         amd64        Bluetooth tools and daemons
ii  bluez-cups                                 5.53-0ubuntu3                         amd64        Bluetooth printer driver for CUPS
ii  bluez-obexd                                5.53-0ubuntu3                         amd64        bluez obex daemon
ii  gir1.2-gnomebluetooth-1.0:amd64            3.34.3-0ubuntu1                       amd64        Introspection data for GnomeBluetooth
ii  gnome-bluetooth                            3.34.3-0ubuntu1                       amd64        GNOME Bluetooth tools
ii  libbluetooth3:amd64                        5.53-0ubuntu3                         amd64        Library to use the BlueZ Linux Bluetooth stack
ii  libgnome-bluetooth13:amd64                 3.34.3-0ubuntu1                       amd64        GNOME Bluetooth tools - support library
ii  pulseaudio-module-bluetooth                1:13.99.1-1ubuntu3.8                  amd64        Bluetooth module for PulseAudio sound server
rfkill list all
0: phy0: Wireless LAN
	Soft blocked: no
	Hard blocked: no
1: hci0: Bluetooth
	Soft blocked: yes
	Hard blocked: no

● bluetooth.service - Bluetooth service
     Loaded: loaded (/lib/systemd/system/bluetooth.service; enabled; vendor preset: enabled)
     Active: active (running) since Thu 2021-01-21 19:16:00 CET; 1h 12min ago
       Docs: man:bluetoothd(8)
   Main PID: 552 (bluetoothd)
     Status: "Running"
      Tasks: 1 (limit: 8806)
     Memory: 2.4M
     CGroup: /system.slice/bluetooth.service
             └─552 /usr/lib/bluetooth/bluetoothd

janv. 21 19:21:44 Hedont-HP-Stream bluetoothd[552]: connect error: Host is down (112)
janv. 21 19:26:49 Hedont-HP-Stream bluetoothd[552]: connect error: Host is down (112)
janv. 21 19:26:54 Hedont-HP-Stream bluetoothd[552]: connect error: Host is down (112)
janv. 21 19:26:59 Hedont-HP-Stream bluetoothd[552]: connect error: Host is down (112)
janv. 21 19:27:04 Hedont-HP-Stream bluetoothd[552]: connect error: Host is down (112)
janv. 21 19:56:06 Hedont-HP-Stream bluetoothd[552]: Failed to set mode: Blocked through rfkill (0x12)
janv. 21 19:58:42 Hedont-HP-Stream bluetoothd[552]: Failed to set mode: Failed (0x03)
janv. 21 19:59:53 Hedont-HP-Stream bluetoothd[552]: Failed to set mode: Failed (0x03)
janv. 21 20:10:08 Hedont-HP-Stream bluetoothd[552]: Failed to set mode: Failed (0x03)
janv. 21 20:18:44 Hedont-HP-Stream bluetoothd[552]: Failed to set mode: Failed (0x03)
Essaye : 
sudo rfkill unblock all
xubu1957 a écritEssaye : 
sudo rfkill unblock all
ça ne donne aucune réponse
Tente : 
sudo /etc/init.d/bluetooth restart
Le BT fonctionne !

Merci xubu1957

Un dernier conseil pour installer un pilote ?
https://www.xp-pen.com/faq-56-210.html
yael@Hedont-HP-Stream:~$ sudo '/home/yael/Téléchargements/xp-pen' 
[sudo] Mot de passe de yael : 
sudo: /home/yael/Téléchargements/xp-pen : commande introuvable
🙁
Bonjour,

Pour la tablette, il faut ouvrir une autre discussion.