I have Ubuntu installed on a Gateway NV53A laptop with Windows 7 removed, and recently when I've tried to start the computer, it gets stuck at the logo screen that says "Ubuntu" with the progress bar lights.
I recently upgraded to 13.04.
I'm able to start by going to advanced options in the GRUB menu and then selecting recovery mode and then hitting F, but I have to do this each time I start. It also seems like it doesn't work as well this way.