During the configuration of Dragonfly you will have to compute the calibration of your camera and you will have to make available the JSON calibration file to the Dragonfly installation running on Ubuntu inside WSL. To do so please follow these steps:
# To access the Windows directory with the calibration file. Assuming the calibration file is inside C:\
cd /mnt/c/
# To copy the file {filename}.json to the correct Dragonfly directory inside Ubuntu
sudo cp {filename}.json ~/dragonfly_linux/application/data/config
Do not make changes of your Ubuntu files using Windows 10!
Creating/changing Ubuntu files in your Ubuntu installation using Windows 10 will likely result in data corruption and/or damage of your Ubuntu environment requiring you to uninstall & reinstall Ubuntu inside WSL!