How to disable bluetooth on ubuntu, xubuntu and linux mint

After upgraded linux kernel to 3.11 on my xubuntu 12.04 LTS laptop, I *feel* my laptop run a bit faster, i want to speed up my laptop even further. I have tweaked my laptop heavily, but have not disabled bluetooth yet (I do not use bluetooth), so now it’s the time to do.

To stop bluetooth service
$ su -
$ service bluetooth stop

To disable bluetooth service on startup
# nano /etc/rc.local
add this line before exit 0
rfkill block bluetooth

To disable the bluetooth driver on startup
# nano /etc/modprobe.d/blacklist.conf
and add this line to blacklist.conf
blacklist btusb

To cut power source for bluetooth to run
# nano /etc/bluetooth/main.conf
InitiallyPowered = true
InitiallyPowered = false

To remove remove bluetooth manager and all its dependencie
# apt-get remove bluez* bluetooth
# apt-get autoremove

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