我尝试了很多解决方案，例如如何激活RTL8723DE的蓝牙设备？，但是在 Ubuntu 16.04 上它们都不适合我。
lspci -knn | grep Net -A2; lsusb
上述命令的输出：
03:00.0 Network controller [0280]: Realtek Semiconductor Co., Ltd. Device [10ec:d723]
DeviceName: Hanksville Gbe Lan Connection
Subsystem: Hewlett-Packard Company Device [103c:8319]
Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
Bus 001 Device 004: ID 1bcf:2c9b Sunplus Innovation Technology Inc.
Bus 001 Device 003: ID 0bda:b009 Realtek Semiconductor Corp.
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub