这个问题似乎很普遍，但是我没有运气就尝试了前面问题中提出的所有解决方案。我的蓝牙只是继续搜索设备而无法检测到它们。
输出为rfkill list：
0: phy0: Wireless LAN
Soft blocked: no
Hard blocked: no
1: hci0: Bluetooth
Soft blocked: no
Hard blocked: no
输出为dmesg | grep Blue：
[ 1.725292] usb 2-4: Product: Bluetooth Radio
[ 22.987302] Bluetooth: Core ver 2.22
[ 22.987324] Bluetooth: HCI device and connection manager initialized
[ 22.987326] Bluetooth: HCI socket layer initialized
[ 22.987328] Bluetooth: L2CAP socket layer initialized
[ 22.987331] Bluetooth: SCO socket layer initialized
[ 24.192938] Bluetooth: hci0: rtl: examining hci_ver=06 hci_rev=000b lmp_ver=06 lmp_subver=8723
[ 24.192940] Bluetooth: hci0: rtl: loading rtl_bt/rtl8723b_config.bin
[ 24.262074] Bluetooth: hci0: rtl: loading rtl_bt/rtl8723b_fw.bin
[ 24.279971] Bluetooth: hci0: rom_version status=0 version=1
[ 24.279990] Bluetooth: hci0: cfg_sz 0, total size 22496
[ 31.827382] Bluetooth: BNEP (Ethernet Emulation) ver 1.3
[ 31.827384] Bluetooth: BNEP filters: protocol multicast
[ 31.827387] Bluetooth: BNEP socket layer initialized
[ 69.606019] Bluetooth: RFCOMM TTY layer initialized
[ 69.606024] Bluetooth: RFCOMM socket layer initialized
[ 69.606029] Bluetooth: RFCOMM ver 1.11
[ 133.549264] Bluetooth: hci0: last event is not cmd complete (0x0f)
[ 149.425182] Bluetooth: hci0: last event is not cmd complete (0x0f)
[ 165.416224] Bluetooth: hci0: last event is not cmd complete (0x0f)
[ 195.195275] Bluetooth: hci0: last event is not cmd complete (0x0f)
[ 210.934271] Bluetooth: hci0: last event is not cmd complete (0x0f)
[ 227.034314] Bluetooth: hci0: last event is not cmd complete (0x0f)
[ 242.896317] Bluetooth: hci0: last event is not cmd complete (0x0f)
[ 259.043361] Bluetooth: hci0: last event is not cmd complete (0x0f)
[ 274.227449] Bluetooth: hci0: last event is not cmd complete (0x0f)
[ 289.383402] Bluetooth: hci0: last event is not cmd complete (0x0f)
[ 305.511470] Bluetooth: hci0: last event is not cmd complete (0x0f)
[ 321.387453] Bluetooth: hci0: last event is not cmd complete (0x0f)
[ 337.520479] Bluetooth: hci0: last event is not cmd complete (0x0f)
[ 353.398532] Bluetooth: hci0: last event is not cmd complete (0x0f)
[ 369.458540] Bluetooth: hci0: last event is not cmd complete (0x0f)
[ 385.298590] Bluetooth: hci0: last event is not cmd complete (0x0f)
[ 401.410629] Bluetooth: hci0: last event is not cmd complete (0x0f)
[ 417.274763] Bluetooth: hci0: last event is not cmd complete (0x0f)
[ 433.471653] Bluetooth: hci0: last event is not cmd complete (0x0f)
[ 449.380746] Bluetooth: hci0: last event is not cmd complete (0x0f)
[ 465.528845] Bluetooth: hci0: last event is not cmd complete (0x0f)
[ 481.409819] Bluetooth: hci0: last event is not cmd complete (0x0f)
[ 497.533809] Bluetooth: hci0: last event is not cmd complete (0x0f)
[ 513.404936] Bluetooth: hci0: last event is not cmd complete (0x0f)
[ 529.532964] Bluetooth: hci0: last event is not cmd complete (0x0f)
[ 545.408026] Bluetooth: hci0: last event is not cmd complete (0x0f)
输出为lspci -knn | grep Net -A2; lsusb：
0a:00.0 Network controller [0280]: Realtek Semiconductor Co., Ltd. RTL8723BE PCIe Wireless Network Adapter [10ec:b723]
Subsystem: Hewlett-Packard Company RTL8723BE PCIe Wireless Network Adapter [103c:2231]
Kernel driver in use: rtl8723be
Kernel modules: rtl8723be
Bus 001 Device 002: ID 8087:8001 Intel Corp.
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 003 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
Bus 002 Device 002: ID 0bda:b001 Realtek Semiconductor Corp.
Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
在尝试了太多解决方案之后，我擦除了整个磁盘并安装了新的18.04 LTS版本（我使用的是HP 15 Notebook），但仍然存在相同的问题。
我部分解决了运行以下命令的问题：
sudo apt-get install build-essential git
git clone https://github.com/lwfinger/rtlwifi_new/
cd rtlwifi_new
make
sudo make install
echo "options rtl8723be fwlps=0" | sudo tee /etc/modprobe.d/rtl8723be.conf
之后，您可能会遇到wifi连接缓慢的问题，我使用以下命令修复了该问题：
sudo modprobe -r iwlwifi sudo modprobe iwlwifi 11n_disable=1
echo "options iwlwifi 11n_disable=1" | sudo tee /etc/modprobe.d/iwlwifi.conf
重要提示：这不能完全解决问题，我必须关闭wifi，搜索并配对蓝牙设备，然后再次打开wifi。我不知道为什么会这样，但是谷歌搜索告诉我，ubuntu驱动程序与像我一样的rtl8723b适配器有问题
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我来说两句