VelociDrone uses the Unity Engine and for systems that are not UTF8 English it is necessary to run the following command in a terminal prompt and then start VelociDrone via the command line:
export LC_ALL="en_US.UTF-8"
This just defaults the system to run VelociDrone using English US UTF8 encoding which stops problems like number formatting issues that can upset the code inside of VelociDrone doing numerical calculations.
Typically if you can run the sim but you are unable to get the quad to fly then the above may be a good solution for you.