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I think it has something to do with the fact that I just installed Kernel 3.5 because it stopped working after this. I can't even get to the login. I don't know how to get into recovery mode or GRUB mode. I'm running Ubuntu desktop as well as Windows 7. Can somebody help me please?

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Try pressing Esc right after your BIOS loads. –  Mitch Jul 13 '12 at 18:28
    
Welcome to Ask Ubuntu! This question should instead be filed as a bug report, and as such is off-topic, thanks! Instructions on filing a bug report are here. –  Jorge Castro Jul 14 '12 at 0:57
    
You should file this bug with ubuntu-bug linux so that it can be fixed. –  Jorge Castro Jul 14 '12 at 0:58

1 Answer 1

The mainline/Quantal kernel doesn't work for you, you need to go back to your old kernel

Related: Should I upgrade to the "mainline" kernels?

  • Keep Shift pressed after turning on your computer.
  • You will see the Grub menu as shown below. User the down arrow to go to "Previous Linux Versions" and press Enter

    enter image description here

  • Select the option which has a version of x.x.x-generic, NOT one that has x.x.x-yyyyyy-generic and press Enter. This is usually the first option unless you have installed multiple mainline/custom kernels.

    enter image description here

  • Once successfully booted and logged in, remove the 3.5 kernel with:

     sudo dpkg -r linux-image-3.5\*
    
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