Meu dispositivo bluetooth não consegue encontrar o sinal de nenhum outro dispositivo - Ubuntu 18.04?

Meu dispositivo bluetooth não consegue encontrar nenhum dispositivo, embora eu os ligue. Eu não tenho idéias, você pode me ajudar?

Estas são algumas informações:

rfkill:

$ sudo rfkill list
0: hci0: Bluetooth
    Soft blocked: no
    Hard blocked: no

bluetoothctl:

$ bluetoothctl 
[NEW] Controller AC:D1:B8:C6:3E:D2 cons [default]
Agent registered
[bluetooth]# power on 
Changing power on succeeded
[bluetooth]# disco
disconnect    discoverable  
[bluetooth]# discoverable on
Changing discoverable on succeeded
[CHG] Controller AC:D1:B8:C6:3E:D2 DiscoverableTimeout: 0x00000000
[CHG] Controller AC:D1:B8:C6:3E:D2 Discoverable: no
[CHG] Controller AC:D1:B8:C6:3E:D2 Discovering: no
[CHG] Controller AC:D1:B8:C6:3E:D2 Discoverable: yes
Agent unregistered
[DEL] Controller AC:D1:B8:C6:3E:D2 cons [default]
Waiting to connect to bluetoothd...

serviço:

~$ sudo service bluetooth status
● bluetooth.service - Bluetooth service
   Loaded: loaded (/lib/systemd/system/bluetooth.service; enabled; vendor preset
   Active: active (running) since Mon 2018-08-13 21:03:04 +07; 1min 23s ago
     Docs: man:bluetoothd(8)
 Main PID: 6026 (bluetoothd)
   Status: "Running"
    Tasks: 1 (limit: 4915)
   CGroup: /system.slice/bluetooth.service
           └─6026 /usr/lib/bluetooth/bluetoothd

Aug 13 21:03:04 cons systemd[1]: Starting Bluetooth service...
Aug 13 21:03:04 cons bluetoothd[6026]: Bluetooth daemon 5.48
Aug 13 21:03:04 cons systemd[1]: Started Bluetooth service.
Aug 13 21:03:04 cons bluetoothd[6026]: Starting SDP server
Aug 13 21:03:04 cons bluetoothd[6026]: Bluetooth management interface 1.14 initi
Aug 13 21:03:04 cons bluetoothd[6026]: Endpoint registered: sender=:1.38 path=/M
Aug 13 21:03:04 cons bluetoothd[6026]: Endpoint registered: sender=:1.38 path=/M
lines 1-17/17 (END)

Tente no terminal

bluetoothctl

Então

power on

Então

scan on

tudo deve ser feito consecutivamente, se isso não funcionar, tente instalar o programa Blueman GUI com este comando

sudo apt-get install blueman -y