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I can not log in to my ubuntu 12.4, not even as a guest. Every time i try it push me back to log in screen. And it says something like "suitable mode for kernel not found" I just instal ubuntu few weeks ago and was so happy with it until now. Can someone please help me.

I Solve the problem!!!!

I log in to bash, (Ctrl+Alt+F1)

sudo apt-get update

sudo apt-get install --reinstall ubuntu-desktop

and it worked for me ;)

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Have you made any modifications on your installation just before the issue appears? For example, installing drivers, updates...etc –  Ahmadgeo Mar 25 '13 at 1:05
    
I dont remember I was doing any modifications, maybe I did something by accident Im new to all this –  Hrvach Mar 25 '13 at 1:57
    
If you solved the problem, please post it as an answer yourself. –  user98085 Mar 28 '13 at 0:35

1 Answer 1

Try the following.

When you reach the Login Screen , press CTRL+ALT+F1 to redirect to Console Mode. There login with your username & password and issue the following commands one by one

sudo service lightdm stop

rm ~/.Xauthority

sudo service lightdm start

retry to login now.

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