How can I deactivate Bluetooth on system startup?
18.04+ users who don't naturally have a /etc/rc.local, you'll need to create one and make it executable. To make things slightly easier, you can just paste the following command into a terminal:
sudo install -b -m 755 /dev/stdin /etc/rc.local << EOF #!/bin/sh rfkill block bluetooth exit 0 EOF
sudoedit /etc/rc.local and add this before line with
rfkill block bluetooth
You should still be able to enable Bluetooth through the top bar applet.
This should work for most systems but it looks like there are a few bugs lurking in the kernel's ACPI for Thinkpads. If you're on a Thinkpad, add the following to
echo disable > /proc/acpi/ibm/bluetooth
Or check out ibm-acpi - IBM ThinkPad ACPI Extras Driver -- some reports suggest that ibm-acpi includes bluetooth control (amongst other nice things). But I don't have the hardware so I'm completely unable to verify these claims. Good luck.