I asked for help and then realised I had done it in the wrong forum.
Here it is again:
I should say that from my side the game has been played on two Debian buster machines with very different hardware. It does not go away when the vlog files on that other machine.
This one has the following details:
root@leonhartsberger:/home/nicholas/VASSAL/VASSAL-3.2.17# /usr/sbin/hwinfo --short
cpu:
Intel(R) Pentium(R) CPU N3540 @ 2.16GHz, 500 MHz
Intel(R) Pentium(R) CPU N3540 @ 2.16GHz, 500 MHz
Intel(R) Pentium(R) CPU N3540 @ 2.16GHz, 500 MHz
Intel(R) Pentium(R) CPU N3540 @ 2.16GHz, 500 MHz
keyboard:
/dev/input/event0 AT Translated Set 2 keyboard
mouse:
/dev/input/mice Cygnal Integrated USB OPTICAL MOUSE
/dev/input/mice ETPS/2 Elantech Touchpad
monitor:
AUO LCD Monitor
graphics card:
Intel Atom Processor Z36xxx/Z37xxx Series Graphics & Display
sound:
Intel Atom Processor Z36xxx/Z37xxx Series High Definition Audio Controller
network:
wlan0 Qualcomm Atheros QCA9565 / AR9565 Wireless Network Adapter
eth0 Realtek RTL810xE PCI Express Fast Ethernet controller
network interface:
lo Loopback network interface
wlan0 WLAN network interface
eth0 Ethernet network interface
disk:
/dev/mmcblk0 Disk
partition:
/dev/mmcblk0p1 Partition
/dev/mmcblk0p2 Partition
/dev/mmcblk0p3 Partition
usb controller:
Intel Atom Processor Z36xxx/Z37xxx, Celeron N2000 Series USB xHCI
bios:
BIOS
bridge:
Intel Atom Processor E3800 Series PCI Express Root Port 1
Intel Atom Processor Z36xxx/Z37xxx Series Power Control Unit
Intel Atom Processor E3800 Series PCI Express Root Port 4
Intel Atom Processor Z36xxx/Z37xxx Series SoC Transaction Register
Intel Atom Processor E3800 Series PCI Express Root Port 2
hub:
Linux Foundation 2.0 root hub
Linux Foundation 3.0 root hub
memory:
Main Memory
bluetooth:
IMC Networks Bluetooth Device
unknown:
FPU
DMA controller
PIC
Keyboard controller
PS/2 Controller
Realtek RTS5286 PCI Express Card Reader
Intel Atom Processor E3800 Series SMBus Controller
Intel Atom Processor Z36xxx/Z37xxx Series Trusted Execution Engine
/dev/ttyS0 16550A
/dev/input/event14 Chicony Electronics USB2.0 VGA UVC WebCam