alors pour répondre
a priori ça ne vient pas de ma façon de faire, il est apairé avec mon smartphone sans problème
pour le résultat des commandes:
$ uname -a; lspci -nnk | grep -iA3 net; lsusb; dmesg | grep -i bluetooth; dmesg | grep -i firmware; lsmod | grep bluetooth
Linux mathieu-notebook 5.0.0-8-generic #9-Ubuntu SMP Tue Mar 12 21:58:11 UTC 2019 x86_64 x86_64 x86_64 GNU/Linux
01:00.0 Network controller [0280]: Intel Corporation Wireless 7265 [8086:095a] (rev 59)
Subsystem: Intel Corporation Dual Band Wireless-AC 7265 [8086:5010]
Kernel driver in use: iwlwifi
Kernel modules: iwlwifi
Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
Bus 001 Device 003: ID 13d3:5679 IMC Networks
Bus 001 Device 002: ID 8087:0a2a Intel Corp.
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
[ 10.713509] Bluetooth: Core ver 2.22
[ 10.713535] Bluetooth: HCI device and connection manager initialized
[ 10.713541] Bluetooth: HCI socket layer initialized
[ 10.713544] Bluetooth: L2CAP socket layer initialized
[ 10.713549] Bluetooth: SCO socket layer initialized
[ 10.881715] Bluetooth: hci0: read Intel version: 370810225019140f34
[ 10.881718] Bluetooth: hci0: Intel device is already patched. patch num: 34
[ 15.315237] Bluetooth: BNEP (Ethernet Emulation) ver 1.3
[ 15.315240] Bluetooth: BNEP filters: protocol multicast
[ 15.315246] Bluetooth: BNEP socket layer initialized
[ 122.101809] Bluetooth: RFCOMM TTY layer initialized
[ 122.101816] Bluetooth: RFCOMM socket layer initialized
[ 122.101824] Bluetooth: RFCOMM ver 1.11
[ 0.141479] Spectre V2 : Enabling Restricted Speculation for firmware calls
[ 1.374373] tpm tpm0: [Firmware Bug]: TPM interrupt not working, polling instead
[ 10.716233] elan_i2c i2c-ELAN0000:00: Elan Touchpad: Module ID: 0x008f, Firmware: 0x0005, Sample: 0x0008, IAP: 0x0009
[ 10.817021] iwlwifi 0000:01:00.0: loaded firmware version 29.1044073957.0 op_mode iwlmvm
[ 11.213289] [drm] Finished loading DMC firmware i915/skl_dmc_ver1_27.bin (v1.27)
[ 11.771974] snd_soc_skl 0000:00:1f.3: Direct firmware load for 9d70-CORE-COREBOOT-0-tplg.bin failed with error -2
[ 11.771999] snd_soc_skl 0000:00:1f.3: Direct firmware load for dfw_sst.bin failed with error -2
bluetooth 561152 31 btrtl,btintel,btbcm,bnep,btusb,rfcomm
ecdh_generic 28672 2 bluetooth
bluetooth.service - Bluetooth service
Loaded: loaded (/lib/systemd/system/bluetooth.service; enabled; vendor preset: enabled)
Active: active (running) since Wed 2019-04-03 18:29:46 CEST; 4min 49s ago
Docs: man:bluetoothd(8)
Main PID: 936 (bluetoothd)
Status: "Running"
Tasks: 1 (limit: 4551)
Memory: 2.3M
CGroup: /system.slice/bluetooth.service
└─936 /usr/lib/bluetooth/bluetoothd
avril 03 18:29:46 mathieu-notebook systemd[1]: Starting Bluetooth service...
avril 03 18:29:46 mathieu-notebook bluetoothd[936]: Bluetooth daemon 5.50
avril 03 18:29:46 mathieu-notebook bluetoothd[936]: Starting SDP server
avril 03 18:29:46 mathieu-notebook systemd[1]: Started Bluetooth service.
avril 03 18:29:46 mathieu-notebook bluetoothd[936]: Bluetooth management interface 1.14 initialized
avril 03 18:31:33 mathieu-notebook bluetoothd[936]: Endpoint registered: sender=:1.314 path=/MediaEndpoint/A2DPSource
avril 03 18:31:33 mathieu-notebook bluetoothd[936]: Endpoint registered: sender=:1.314 path=/MediaEndpoint/A2DPSink
$ dpkg -l | grep blue
ii bluez 5.50-0ubuntu2 amd64 Bluetooth tools and daemons
ii bluez-cups 5.50-0ubuntu2 amd64 Bluetooth printer driver for CUPS
ii bluez-obexd 5.50-0ubuntu2 amd64 bluez obex daemon
ii gir1.2-gnomebluetooth-1.0:amd64 3.32.0-1 amd64 Introspection data for GnomeBluetooth
ii gnome-bluetooth 3.32.0-1 amd64 GNOME Bluetooth tools
ii indicator-bluetooth 0.0.6+17.10.20170605-0ubuntu3 amd64 System bluetooth indicator.
ii libbluetooth3:amd64 5.50-0ubuntu2 amd64 Library to use the BlueZ Linux Bluetooth stack
ii libgnome-bluetooth13:amd64 3.32.0-1 amd64 GNOME Bluetooth tools - support library
ii pulseaudio-module-bluetooth 1:12.2-2ubuntu1 amd64 Bluetooth module for PulseAudio sound server
$ rfkill list all
0: hci0: Bluetooth
Soft blocked: no
Hard blocked: no
1: phy0: Wireless LAN
Soft blocked: no
Hard blocked: no