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:
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.