I created a Ubuntu USB using rufus so that i can install Ubuntu on my Acer One 10 laptop/tablet convertible. The first time I booted using the USB i tried Ubuntu without installing to make sure it worked correctly, and it did, except for the keyboard. Then i shut it down, and booted it back up to actually install Ubuntu; the keyboard still didn't work, so i got up to plug in a separate keyboard, and I dropped it and the USB came out in the middle of the installation process. Now I can't get past the grub menu. I have tried it with 2 other USB's, and my sister's computer (same model), re-downloaded the ISO and re-imaged all three USB's several times, trying to troubleshoot the issue. The screen still just goes black after selecting an option from the grub menu.
As you were not able to complete the installation process. Try reinstalling it by USB, grub won't work as the OS is currently not installed.