Work on Jessie (Odrobian)
Steps to install ################
mkdir /etc/systemd/system/bluetooth.service.d
vim /etc/systemd/system/bluetooth.service.d/customexec.conf
systemctl daemon-reload
systemctl restart bluetooth
Step to check ############
systemctl status bluetooth -l
Error is allways present, but...
hcitool dev
Work fine ;-).