[all variants] Does Ubuntu actually use multiple Cores for anything?

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http://ubuntuforums.org – Well I don't get why you would get a Multi-core processor if it doesn't. If I was using Just Ubuntu would multiple cores really matter as any CPU intensive things (Gaming as an example) that would use multiple cores are non-existent on Ubuntu. I'm also talking about the Physical Limitations of Linux as a whole. Are there any Programs that use multiple cores? (Hardware)