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I just installed a fresh Kubuntu 12.10 on a machine beside Windows 7. After successful installation, I rebooted and wanted to login. But when I type my password and hit Enter, some command line screen shows up for the split of a second and then it thows me back to the login screen without any error message. It's hard to spot what the command line text says, but I couldn't see any error or something like that. Anyway, when I log in as guest (without password), everything works finely. Also, when going to a system command line (using Ctrl+Alt+F1), I can login with my account without any problems.

Does anyone have a clue what is going on and how to fix it?

Update:

I made an image of the shortly appearing screen, there seems to be no special problem (sorry for the bad quality): enter image description here

On the right side, every line says [OK]

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Sounds like an XORG configuration problem in your specific user account. Can you post the contents of ~/.xinitrc and ~/.bash_profile? You can get them as root from /home/normalUserName/.{xinitrc,bash_profile} (you may not have them, which might require you making them). – nerdwaller Oct 25 '12 at 23:05
    
They did not exist, so I created them. I still couldn't login afterwards. What function do they have, why were they missing? – Cedric Reichenbach Oct 26 '12 at 16:58
    
Btw, the shut down button on the login screen is not working either (it does absolutely nothing). And: I managed to make a "screenshot" of the quickly appearing command line screen with my camera, see update on my post. – Cedric Reichenbach Oct 26 '12 at 17:14
1  
1) Well they should have stuff telling your system what to do, the bash_profile is fine to not have but I thought KDE makes an .xinitrc... Did it let you log in as root? If so, can you get the contents of your /var/logs/xorg file? If you cannot - see my next comment. – nerdwaller Oct 26 '12 at 17:29
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2) If you cannot login GUI with Root: hit Ctrl+Alt+F3, it should bring you to a text based login screen. Type root and your root password. Then try doing a full system upgrade. apt-get update && apt-get upgrade – nerdwaller Oct 26 '12 at 17:30
up vote 0 down vote accepted

Just if others had a similar problem, this is what caused mine and how I resoved it:

I had installed a kubuntu 10.04 before (which was broken) and just installed 12.10 over it, assuming everything would be replaced. To my surprise, some fragments remained and interferred with my new installation. I could start the GUI as root by switching to a command line (Ctrl+Alt+F1) and typing sudo startx, just in case you need to backup some data. Then, I reinstalled Kubuntu 12.10 completely with the option enabled to format the selected hard disk partition before installing.

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