linux newbie..dont know how to get into GUI mode..does any GUI exists for linux..??

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http://www.linuxquestions.org – Hey all I just bought a Acer Aspire one lap yesterday and it is preinstalled with Linux os. I have never used linux before and dont kno w what exactly to do now..im thinking t o be with it but does any gui exists for linux and if so, how to get into it and does it need any process..please help.. (HowTos)