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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.
@Gordon
Which demo did you upload? And what did the ghost keyboard start typing?
The easiest way to test if your Ubuntu machine can even detect BLE is to run
sudo hcitool lescan- if it supports bluetooth LE should should see the Pucks being reported. You could also give the command-line application a try