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This problem seems to be common but i tried all the solutions proposed in previous questions with no luck. my Bluetooth just keep searching for devices and it can't detect them.

output for rfkill list :

0: phy0: Wireless LAN

Soft blocked: no

Hard blocked: no

1: hci0: Bluetooth

Soft blocked: no

Hard blocked: no

output for 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)

output for 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

after trying too many solution i erased the whole disk and installed a fresh 18.04 LTS version (i'm using HP 15 Notebook) but still the same problem.

I had the same problem and found this:

"A brilliant developer named Takashi Iwai came up with a solution that I incorporated into the 4.15 kernel

sudo apt install git build-essential dkms

git clone https://github.com/jeremyb31/newbtfix-4.15.git

sudo dkms add ./newbtfix-4.15

sudo dkms install btusb/4.0

Reboot"

Found here
ubuntu 18.04 LTS bluetooth discovery not working

I had to install git manually from Synaptic. I don't understand what it does, but it worked for me.

I partially fixed the problem running the following commands:

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

you might face a problem of a slow wifi connection after that, I fixed it with following commands:

sudo modprobe -r iwlwifi sudo modprobe iwlwifi 11n_disable=1

echo "options iwlwifi 11n_disable=1" | sudo tee /etc/modprobe.d/iwlwifi.conf

IMPORTANT:
This did not fix the problem totally, I have to close wifi, search and pair bluetooth device then open wifi again. I don't know exactly why is this happening but googling told me that ubuntu drivers are problematic with rtl8723b adapters like mine

I'm on Mint and started getting this same "last event is not cmd complete (0x0f)" bluetooth network connection problem after the kernel updated to 4.15.0.33, nothing I did would fix it, but I booted into 4.15.0.32 and it worked again.

So since Ubuntu 18.04 also uses the 4.15 kernel, it's quite likely that you're experiencing the same problem, try booting in on 4.15.0.32 or less and see if that fixes the problem.