Kubuntu hangs at login

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http://www.kubuntuforums.net – So I've just installed Kubuntu 13.04 Raring Ringtail and it hangs on the login screen. I have reinstalled it 5 times and still have the same problem :( I have included a picture so you can see where it hangs. https://docs.google.com/file/d/0B5rV...it?usp=sharing This is a complete system lockup and the cursor is immovable (HowTos)