I am working on installing  a thumbDV on a current release Ubuntu machine. I have followed the instructions John provided "Quick Build on Linux" but I have run into problem(s).
The download and compilation of the source file goes OK.
Likewise the installation of the executable and support files look like it went OK.
I have edited the file ambeserver-ttyUSB0.conf to look like:
#
# Configuration file for the AMBEserver program started by systemd.
# Adding flags to AMBESERVER_FLAGS will pass this to the daemon.
# For example, to change the speed to 460800, use the following line:
# AMBESERVER_FLAGS="-s 460800"
#

UDP_PORT=2460
# AMBESERVER_FLAGS=""
AMBESERVER_FLAGS="-s 460800"

When I start the service I get error messages:
sudo systemctl status ambeserver@...
● ambeserver@... - DV3000 Daemon
     Loaded: loaded (/lib/systemd/system/ambeserver@.service; enabled; vendor preset: enabled)
     Active: failed (Result: exit-code) since Fri 2020-04-24 13:28:07 EDT; 33s ago
    Process: 111775 ExecStartPre=/bin/chgrp dialout /dev/ttyUSB0 (code=exited, status=217/USER)

Apr 24 13:28:07 ubuntu1 systemd[1]: Starting DV3000 Daemon...
Apr 24 13:28:07 ubuntu1 systemd[111775]: ambeserver@...: Failed to determine user credentials: N>
Apr 24 13:28:07 ubuntu1 systemd[111775]: ambeserver@...: Failed at step USER spawning /bin/chgrp>
Apr 24 13:28:07 ubuntu1 systemd[1]: ambeserver@...: Control process exited, code=exited, status=>
Apr 24 13:28:07 ubuntu1 systemd[1]: ambeserver@...: Failed with result 'exit-code'.
Apr 24 13:28:07 ubuntu1 systemd[1]: Failed to start DV3000 Daemon.
Apr 24 13:28:07 ubuntu1 systemd[1]: ambeserver@...: Triggering OnFailure= dependencies.

I am not sure what's going on. Looking foe some guidance!
73,
John, NX2I