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Click Alt F1 or the Meta key, or touch the pointer to the top left corner (a.k.a. the "hot corner") to enter the Activities overview.
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Type 'sound'.
Click on the Sound icon under Preferences .
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Select the Sound Effects tab in the Sound Preferences window.
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You can change which sound is made by changing the Sound Theme.
Choose a Sound Theme other than No sounds.
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Check Enable window and button sounds.
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Make sure that the Alert volume and Output volume are turned up and that
Mute is not checked.
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Click Close.