[ubuntu] Hardware check ?

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http://ubuntuforums.org – Hi all ! :) I'm new on ubuntu 9.04 and as a starter I'd like to know how one does to check the current system hardware configuration (what type of ram, cpu, gpu, mb and such ...) Do I need to install a third-party software to do the check up ? or has 9.04 an inbuilt feature ? Thanks in advance ! (Hardware)