Will ubuntu and games like dota 2 and league of legends work on my computer?

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http://askubuntu.com – It is an acer aspire 5742g notebook: Intel i3 2.53 mhz , 3 gb ddr 3 , hdd 500 gb , video intel hd g with 256mb ( on w7 on this graphic board run windows ) and a nvidia 520m 1gb video (HowTos)