Where did all display resolutions go?

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http://askubuntu.com – I just installed Ubuntu 12.04 on my new laptop. After testing some things with the liveCD. When I ran Ubuntu with the liveCD I could choose between a number of different resolutions for my display, but after installing Ubuntu on my hard drive there's only one option left (highest available res). How do I get all the different resolution options back like they were presented on the liveCD? (HowTos)