updates and update of serial 3.3 and serialk server 2.0.

[baltika_no_9]

The unreliable network really has to be a major culprit in what you're seeing that's why, unless I am missing something, it wouldn't be better to do the entire build at home with a reliable Internet connection and then do the final tweaks on the boat when such a connection is not required. I haven't ever and wouldn't ever attempt a build or update while on the boat.

I'm pleased that you have a working system now though, what a struggle.

Those GPG errors for Influxdb and Grafana look very much like the result of the emergency key rotation arising from the breach in January of this year but you've overcome that which is good.

I hope your troubles are coming to an end.