Ubuntu doesn't boot because of graphics problem

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http://askubuntu.com – While booting my Ubuntu 12.04 I got an error telling my that my graphics is not identified and I have to identify it manually by modifying some configurations. And then it allows me the choose from few options : Login with minimal graphics for one session: It shows a finished progress bar, clicking "OK" opens a fullscreen terminal that I can't control, it only shows some process starting and ending(Apache2, bind, etc). troubleshoot the problem : it shows few options(logs, etc) I chose to see a log, walked through it really fast, nothing suspicious. And there was startup logs aswell, whi (HowTos)