I am attempting to install Polyphone Soundfont Editor v1.9 on Ubuntu 18.04. When I selected to download and install via the Ubuntu software center, I clicked the Install button. Next, I was prompted to enter my password. After entering it, the installer appeared to run for about a second, then the display returned to the Install button. Since this didn't work, I downloaded the source files, verified that all dependencies were installed, then ran the instructed make command. Everything appeared to build fine, but when I attempted to run the application executable I got a message that no software was installed that is capable of opening it. Has anyone had success installing this, and if so, how?