Rfcomm failures in ubuntu Server Image and Debian desktop image

[Dante4]

What does
systemctl status bluetooth
says?

Also, read this

Ubuntu Server Image, No Bluetooth

No bluetooth adapter found rock@RockPi(~):ls /lib/modules/4.4.154-59-rockchip-g5e70f14/kernel/drivers bcma block gpu i2c md media misc mtd net pps scsi ssb switch usb w1 rock@RockPi(~):hcitool dev Devices: rock@RockPi(~):hcitool scan Device is not available: No such device lsmod and dmesg both produce no bluetooth output Any suggestions?