How to disable the screensaver in Ubuntu Classic Gnome

Note that screensaver preferences are a per-user setting, meaning each user has their own settings. If you’re experiencing issues with the screensaver (lack of OpenGL acceleration, system hanging, etc) you’ll want to disable them for each user account.

Open System > Preferences > Screensaver (see the screenshot below)

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Uncheck “Activate screensaver when computer is idle” then click Close.

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Changes take effect immediately.