Some while ago I ran one of the example sketches which displayed the current time, having initialised the Arduino time from Linux/Ubuntu using “date +T%s\n >/dev/ttyACM0” at the console. This worked fine.
I am now trying to get the example sketch time serial to work (and hoping to incorporate this in my project sketch) on another machine, but when attempting to issue the date command get ‘device or resource busy’.
I can’t work out what is now different, nor how to resolve the issue. This appears to be more of an Ubuntu/Debian Linux issue, but I am not sure.