[cbk1994]

My guess is you just need to install libsdl-mixer1.2 (run `apt-get install libsdl-mixer1.2`) but can't say for certain without seeing the output you get when you run Graal.

Try running Graal from the Terminal (open a terminal, drag the binary on top of the terminal, press enter in the terminal) and you'll be able to see the error messages (if any).