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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
Are you running Espruino itself on Linux, or are you running it on your Espruino Pico board?
The remark was to do with what happens if you run the Espruino interpreter itself on Linux (eg. Raspberry Pi) - I think in that case it's more to do with Espruino's serial port implementation on Linux. Since you're only using Linux as the machine that talks to the Pico you should be fine (I use Linux for everything and don't have problems).
Can you try
at.debug()first? That should give you some debugging information about what's being sent/received.Also, have you checked that the baud rate/bits/parity is all correct?