Using Ubuntu Core devices it is not always possible to access via SSH and bluez usually doesn't start up the bluetooth at boot.


 1 - install bluez to allow bluetooth usage:
    "sudo snap install bluez"
 2 - check dongle compatibility
    "sudo bluez.hciconfig"
    the log must show up the HCI devices with their state
 3 - install bluetooth autosatart 
    "sudo snap install bluetooth-autostart"
 4- connect if needed the proper interface:
     "sudo snap connect bluetooth-autostart:bluetooth-control" 

basically this app runs the "hcicconfig hci0 up" command.

Get it from the Snap Store

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