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It is usually done with a setting in the software accessing the sound card, and the specifics of what to do depend on which sound system you're using.
I think that Ubuntu uses GNOME as it's desktop manager. If that's the case, try going to Preferences->Hardware->Sound and clicking on the "Sounds" tab. See if checking "Enable software sound mixing" helps.
Note: I've never used Ubuntu, so I'm just guessing.
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