Ubuntu 18.04 - 蓝牙不工作

我使用的是 Ubuntu 18.04 LTS，我的笔记本电脑没有扫描其他设备。我尝试连接的所有设备都功能齐全，并且可以与其他设备和平台一起使用。

我尝试了以下方法：

$蓝牙控制

这就是我得到的：

[NEW] Controller 34:23:87:DC:89:A8 Linux [default]
Agent registered
[bluetooth]# power on
Changing power on succeeded
[bluetooth]# scan on
Discovery started
[CHG] Controller 34:23:87:DC:89:A8 Discovering: yes
[bluetooth]# list
Controller 34:23:87:DC:89:A8 Linux [default]
[bluetooth]# devices
[bluetooth]# exit
Agent unregistered
[DEL] Controller 34:23:87:DC:89:A8 Linux [default]

我尝试了以下解决方案：

1. https://askubuntu.com/a/1043219/1053060
2. https://askubuntu.com/a/808114/1053060

更新：输出sudo service bluetooth status：

● bluetooth.service - Bluetooth service
   Loaded: loaded (/lib/systemd/system/bluetooth.service; enabled; vendor preset: enabled)
   Active: active (running) since Tue 2020-03-17 22:36:42 PKT; 8min ago
     Docs: man:bluetoothd(8)
 Main PID: 729 (bluetoothd)
   Status: "Running"
    Tasks: 1 (limit: 4545)
   CGroup: /system.slice/bluetooth.service
           └─729 /usr/lib/bluetooth/bluetoothd

Mar 17 22:36:42 Linux systemd[1]: Starting Bluetooth service...
Mar 17 22:36:42 Linux bluetoothd[729]: Bluetooth daemon 5.48
Mar 17 22:36:42 Linux systemd[1]: Started Bluetooth service.
Mar 17 22:36:42 Linux bluetoothd[729]: Starting SDP server
Mar 17 22:36:42 Linux bluetoothd[729]: Bluetooth management interface 1.14 initialized
Mar 17 22:37:10 Linux bluetoothd[729]: Endpoint registered: sender=:1.81 path=/MediaEndpoint/A2DPSource
Mar 17 22:37:10 Linux bluetoothd[729]: Endpoint registered: sender=:1.81 path=/MediaEndpoint/A2DPSink