问题：
通过面板控制关闭蓝牙后，蓝牙仍在运行，如下命令所示：
sudo systemctl status bluetooth
● bluetooth.service - Bluetooth service
Loaded: loaded (/lib/systemd/system/bluetooth.service; enabled; vendor preset: enabled)
Active: active (running) since lun. 2018-03-26 10:03:39 CEST; 22min ago
Docs: man:bluetoothd(8)
Main PID: 3713 (bluetoothd)
Status: "Running"
CGroup: /system.slice/bluetooth.service
└─3713 /usr/lib/bluetooth/bluetoothd
下面是附加信息（命令测试、配置）
运行命令测试：
关于官方 ubuntu 蓝牙文档页面，这里是与 bluez 相关的返回：
snap interfaces bluez
Slot Plug
snap interfaces | grep blue
:bluetooth-control -
:bluez -
systemctl status snap.bluez.bluez.service
● snap.bluez.bluez.service
Loaded: not-found (Reason: No such file or directory)
Active: inactive (dead)
类似的讨论
ubuntu 论坛上的类似讨论提出了解决方案，但它们并没有解决我的问题。
版本和内核：
cat /etc/issue
Ubuntu 16.04.4 LTS \n \l
uname -a
Linux dell-vostro1510 4.4.0-67-generic #88-Ubuntu SMP Wed Mar 8 16:34:04 UTC 2017 i686 i686 i686 GNU/Linux
电脑型号及品牌
戴尔 VOSTRO 1510
配置：
lspci -knn | grep Net -A2; lsusb
06:00.0 Network controller [0280]: Broadcom Corporation BCM4312 802.11b/g LP-PHY [14e4:4315] (rev 01)
Subsystem: Dell Wireless 1395 WLAN Mini-Card [1028:000b]
Kernel driver in use: wl
Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 007 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 006 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 005 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 001 Device 003: ID 0c45:63e0 Microdia Sonix Integrated Webcam
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 004 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 003 Device 005: ID 413c:8140 Dell Computer Corp. Wireless 360 Bluetooth
Bus 003 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub