Madsonic Support

I see you've entered a custom port number in your configuration.

Please show the output of: sudo netstat -ntlp

Edit: (06/16/2020) I downgraded from Ubuntu 20.04 to Ubuntu 18.04 and most of my problems with Madsonic disappeared. I suggest you do the same. Preface: I'm running Madsonic 5.0 so this may or may not be of use. I just upgraded my server software from Ubuntu 16.04 with kernel 3.14.0-44 to Ubuntu 20...

[Context: I'm using the Debian/Ubuntu version, so your mileage may vary if you run a different server.]

Which newer version did you try?
Version 6 should work the way I described. You install version 6, then replace the war file with the one from your version 5 install.

I realize this is an old post but I'll put this information here in case anyone else wanders in and needs it. The .deb download may not available anymore but if you still have the .war file from an old install, you can try installing a slightly newer version and replace its .war file with the one fr...

If I read what you wrote, it looks like to purged Subsonic then put Subsonic back on.
Then you installed Madsonic on top of that.

Why not just install Madsonic on its own?