[all variants] Shutdown Shenanigans

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http://ubuntuforums.org – System - Acer Aspire-5332. When I come to shut down my computer, many times it freezes on the "Ubuntu" screen instead of shutting down completely. Pressing any key will shut it down at this point, but it should be doing this automatically. It's irritating. Does anyone know why this happens/ how to fix it? (Hardware)