Unable to start bluetooth

I cannot enable bluetooth. When pressing the bluetooth icon in Settings, it just starts blinking without connecting, and when I go to System settings -> Bluetoot it says "Bluetooth not available. bash-4.2$ devel-su bash-4.2# systemctl restart bluetooth.service Failed to issue method call: Unit bluetooth.service failed to load: No such file or directory. See system logs and 'systemctl status bluetooth.service' for details. I also tried this command: bash-4.2# find | grep bluetooth.service bash-4.2# but gave no entries. How to enable bluetooth without resetting the device?