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Upgrade Ubuntu from from 11.10 to 12.04 on Dell Inspiron 3520

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http://askubuntu.com – I have Ubuntu 11.10 pre-installed on my Dell Inspiron 3520 notebook. When I open the Update Manager there ins't a message that a new release is available and thre isn't an Upgrade button. All the available updates I always install without any problems via the Update Manager. How can I upgrade Ubuntu from 11.10 to 12.04 on my notebook? Is it safe? I mean will all the hardware work OK? Thanks for the answers in advance! (HowTos)