It is a Mega problem. Mount with GDrive works fine. I apologize.

Tom, you beautiful human being, that worked like a charm! I now have a fully working Ubooquity home server running on Android device with a Linux terminal. Thank you so much, that settles my problem! And being so, this is a non issue, you can close it. 

You're moving to Kotlin right? I think I read a comment of yours about that. Is there a specific reason for migrating from Java to Kotlin? 

Again, thank you so much! 

It doesn't have to be; all I'm asking is a way to specify the temp directory through arguments or environment variables. It's a Linux thing and a Linux approach. I'm sure it'll be useful in more scenarios than this. I completely understand if you don't have the time to do it, but it's not a complex thing to do if you do have the time and not a lot of things in your priority queue for Ubooquity. If you still won't do it, I read a comment of yours from 3 years ago saying you won't open source the project. Has that changed?