Upgrade from 11.10 to 12.04 boot problem

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http://askubuntu.com – I’ve used Ubuntu for 3 months now so I’m quite new to Linux or UNIX systems. And would love any help anyone can give me on this problem. I recently upgraded my machine from 11.10 to 12.04. At first my grub was weird (dual boot), now I’m able to get into windows. However, when I select Ubuntu 12.04, it would briefly show the startup screen then it just goes to tty1 and prompting me for username and password. After I enter my username and password I can use the system fine in terminal. How can I get back the desktop? Let Ubuntu work properly? After I get to tty1, there are three line (HowTos)