lsusb

hciconfig

systemctl start bluetooth.service

bluetoothctl

power on

discoverable on

To list all thesystemdservice which are instate=activeandsub=running

1. systemctl list-units --type=service --state=running
   

2. To list all thesystemdserice which are instate=activeand sub either running or exited

   systemctl list-units --type=service --state=active