Install bluez 5.40 for ubuntu

bluez-5_40-install.sh

#!/bin/bash

if [ `bluetoothd -v` == 5.40 ]
then
  echo "This script installs bluez version 5.40 and you already have it installed"
  exit 0
fi

sudo apt-get update
sudo apt-get -y install libglib2.0-dev libdbus-glib-1-dev libudev-dev libical-dev libreadline-dev

if [ ! -f bluez-5.40.tar.xz ]
then
  wget http://www.kernel.org/pub/linux/bluetooth/bluez-5.40.tar.xz
fi

if [ ! -d bluez-5.40 ]
then
  tar xf bluez-5.40.tar.xz
fi

cd bluez-5.40

./configure --prefix=/usr --mandir=/usr/share/man --sysconfdir=/etc --localstatedir=/var --enable-library --disable-systemd --disable-android --enable-experimental
make

sudo systemctl stop bluetooth

sudo make install

sudo cp -f attrib/gatttool /usr/bin/gatttool

if [ ! -f /usr/bin/bluetoothd ]
then
  sudo ln -s /usr/libexec/bluetooth/bluetoothd /usr/bin/bluetoothd
fi

sudo rm /usr/sbin/bluetoothd
sudo ln -s /usr/libexec/bluetooth/bluetoothd /usr/sbin/bluetoothd

sudo sed -i 's/^\(ExecStart=\).*$/\1\/usr\/libexec\/bluetooth\/bluetoothd -E/' /lib/systemd/system/bluetooth.service
sudo systemctl daemon-reload
sudo systemctl restart bluetooth

sudo hciconfig hci0 up

exit 0