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Espruino is a JavaScript interpreter for low-power Microcontrollers. This site is both a support community for Espruino and a place to share what you are working on.
@HughB
I use a chromebook which runs ChromeOS (which is debian based I think).
Possibly try a reboot, in case that causes the Blutooth devices to be detected after the bluez package had been installed.
This article also shows that the Bluetooth device might be working but you you can still
get that error message from the scan command.
https://askubuntu.com/questions/1401495/bluetooth-works-but-hcitool-doesnt
I'm no expert on this stuff - I usually expect trouble when trying anything new with Linux.