Howto enable boot messages in ubuntu 12.04?

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http://askubuntu.com – Hello when I do reboot or init 6 in console under ubuntu 12.04 my system does not start correctly. it freezes in startup process. Wow can I enable the boot-messages instead of the splash-screen. Is this still valid for ubuntu 12.04? How to enable boot messages to be printed on screen during boot up? (HowTos)