Power Suite Ubuntu x86/OS Enhancement Utility/Notification
From ESS-WIKI
Brief:
You can toggle the system notification feature of Ubuntu ON/OFF by clicking the "Stop System Notifications" button.
Usage steps:
Step1. Select the “OS Enhancement Utility” page.
Step2. Click on "Stop System Notification" switch button.
Step3. Click on "Confirm" to change the settings.
Expect Result:
Checking the message notification bar at the top of the Ubuntu desktop, you will find that "Do Not Disturb" has been turned on.