Ubuntu handles audio differently than DOS. In your dosbox.conf , make sure you are using the correct backend:
Old games were designed for 25-66 MHz CPUs. Your modern 3.5 GHz processor will make them run insanely fast. To fix this, DOSBox has a "cycles" system. dosbox ubuntu
Guide (cheatsheet) to install DOSBox on Linux Ubuntu Topic actions Ubuntu handles audio differently than DOS
[autoexec] # Lines in this section will be run at startup mount c ~/dosbox_games c: cls echo Welcome to your DOSBox gaming vault! dosbox ubuntu
c: