Check your Documents folder. There should be a DLS subfolder there. Rename it to something else (just in case) and run the executable again.
If there's no DLS folder in your Documents or no dls.log in there, it's a bit hard for me to debug it remotely. Can you post your PC configuration?
I created a fresh minimal Ubuntu 18.04 VM yesterday with all the latest updates and no dev software, to see if it works. It runs correctly out of the box... :|