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I have a laptop with a dual-boot configuration, Windows 7 in one partition, Ubuntu 13.04 on the other. It was working fine for months, but now, after one of Ubuntu's recommended updates, it won't work anymore. When I boot into Windows, everything works fine, but when I try to boot into Ubuntu, the screen stays black with just a blinking white underscore as if it was a command prompt. (It won't accept any typing, though). Can anyone help?

I saw some solutions that mention Grub, but I don't know how to access that, or even if I have that. When I turn on the computer, I have a menu similar to this one:

enter image description here

But instead of Microsoft Windows Vista, the options are "Windows 7" and "Ubuntu". If I choose Ubuntu, I'm stuck on a black screen with a blinking prompt.

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How did you install Ubuntu? Did you use a Windows Installer called WUBI? –  brim4brim Jun 2 '13 at 20:58
    
@brim4brim WUBI is not available in 13.04. –  Mitch Jun 2 '13 at 21:09
    
I had Ubuntu Installed as 12.10 and upgraded it. I used Universal USB Installer (This: pendrivelinux.com/universal-usb-installer-easy-as-1-2-3) with a Ubuntu ISO. –  Kiloku Jun 2 '13 at 21:15

1 Answer 1

Try recovery mode. To boot into recovery mode, just press the Shift, which will bring up a boot menu. Choose (recovery mode). See if this fixes your issue.

For more information on what can be done in recovery mode, see Recovery Mode

enter image description here

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Following your instructions, the only thing that happened when I pressed shift was that instead of having a black screen with a blinking prompt, I now have a black screen, with "GRUB" written on it and a blinking prompt... –  Kiloku Jun 2 '13 at 21:33
    
There is a way to properly recover it by editing the windows file but I don't know if it would work in 13.04 but I think you could configure grub to work too. However you'll have to wait for someone with the expertise to come along –  brim4brim Jun 2 '13 at 21:35

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