[Xastir] Serial Port wont start

[Norm McMillan]

OK, I'm no noob, more like a "born again", and it has been a few years so I
may be missing something.
Ubuntu 14.04
Dell Optiplex 755
Paccomm Tiny2
xastir 2.0.0-2.1ubuntu1

The Internet interface starts and runs just fine
Serial port, not so much. When I try to start it just sits there. no error
message.

Set up for
Serial TNC on /dev/ttyS0
9600 8N1
tnc-startup.tnc2
tnc-stop-sys

Interestingly gtkterm finds and communicates with the tnc no problem using
thos prams., minicom not!

I guess I'm missing something?

Norm, vk3xci