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yesterday I upgraded my perfectly working Ubuntu 12.04 to 12.10 and while booting for the first time, a window appeared saying it had to boot in low graphics mode because of not finding my configuration. In hopes of overcoming this problem, I upgraded through terminal to 13.04 butthe window still appears. I've tried many things such as reinstalling driver, modifying greeter entry and such, but nothing seems to work. I'm currently running an HP Pavilion dv4 with AMD Athlon x2 processor and ATI HD 3200 graphics. Please help me, I'm quite desperate.

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It would be your graphics driver. It is always recommended to first un-install the graphics driver then upgrade the system and then install it back. I suggest you to completely remove your graphics driver and re-install it once again. I hope it would help you. –  Saurav Kumar Nov 16 '13 at 19:31
Can you tell me how to do it with terminal commands? I'm not very good at Linux. –  user216447 Nov 16 '13 at 20:10
check the link here. –  Saurav Kumar Nov 16 '13 at 20:18
Thanks, it did finally load the graphic interface but it doesn't load anything else, it's just my wallpaper withno upper bar or anything. What can I do to fix it? –  user216447 Nov 16 '13 at 21:41
I figured out what to do, thanks a lot for your help, mate! You saved my Ubuntu –  user216447 Nov 17 '13 at 5:59

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