As said, I installed Ubuntu 12.04 in dual boot with my previous Windows Vista on my laptop. I run the boot repair, and did Recommended Repair. I can get into Windows, but not Ubuntu. Although I can select it on boot menu, then it gives me a black screen, and doesn't pass from this. However, I can hear the sound of the ubuntu startup, but I get no image, only black
This is the output: "Boot successfully repaired.
Please write on a paper the following URL: http://paste.ubuntu.com/6147436/
In case you still experience boot problem, indicate this URL to: firstname.lastname@example.org or to your favorite support forum.
You can now reboot your computer."