I was able to get OpenSong to install on Linux Mint both by changing the dependency in the deb package, and also by downloading and extracting the tar file and running it directly. In both cases, the same happens: splash screen appears, a dialog appears with "Select the OpenSong Documents folder. I select an empty folder, nothing happens from there on. So I did some research, and found about having a folder with some specific sub-folders in it, I created those and selected that folder, but still...