If you're using gnome as desktop, you should seek for gstreamer compatible plugins: https://wiki.archlinux.org/title/MIDI#GStreamer-based_players https://wiki.

If you're using gnome as desktop, you should seek for gstreamer compatible plugins: https://wiki.archlinux.org/title/MIDI#GStreamer-based_players https://wiki.archlinux.org/title/MIDI#GStreamer-based_player... I'm using Fedora rn, so I adjusted the packages names and did something similar to the arch wiki, so I'm not sure the closest ones for Ubuntu. I find VLC ugly, but if you can live with it, just install the vlc plugin like a sibling post here said. Fluidsynth is amazing and I'm using it to emulate a decent enough synth for dosbox games.