When I boot my laptop, Bluetooth was on by default:

after searching a while I found it is possible to set it to off when I start up my laptop:

To do this we will edit the “rc.local” file and add a command “rfkill block bluetooth”

step 1. Open rc.local as root in a text editor. in my case I used Gedit.

sudo gedit /etc/rc.local

It will open the rc.local file. Just add the following line just before the last line (which is “exit 0”. )

rfkill block bluetooth

Restart your PC to confirm the change.