ATI Mobility Radeon HD 5450

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I think undeath read that as 4550 not 5450. You shouldn't have any trouble getting fglrx installed for an HD5000 series GPU unless you are just a total linux noob or something. But you should know that AMD is dropping support for this GPU in the next release, so this is the last driver you will be able to install. Good news is, you'll never have to worry about driver updates. Bad news is your GPU won't be supported by any future software.