Ubuntu – How to unlock all tracks in Linux version of SuperTuxKart 0.9

I want to set up an open-source gaming party, kinda small, in my local area, all of the machines running Ubuntu. One of the games I plan on have there is SuperTuxKart, specifically the 0.9 version. I want to unlock everything in the game without taking the time to play through the entire campaign mode, so I figured that I would cheat. I've seen millions of guides telling you to modify ~/.config/supertuxkart/challenges.xml, but for the life of me I cannot find that file in that location. Please help, I need this up and running in a week or so.