Hello to you all. So glad to have found this great community. As says the title, I'm totally new to the Linux universe. My main computer is a 27 iMac running Mountain Lion. I've been a Mac guy for all my life. I bought a mint condition Acer laptop from a friend. Dual boot Windows 7/Ubuntu 14.04. Wanted to try out Freya for obvious reasons à la Mac. Thought it would be easier though. Anyway, I swore to learn and understand Freya and use it. Want to stay away as much as I can from Windows. But right now, I think I put myself into troubles. Welcoming screen let me no more login as the administrator. Can only login as a guest. Plus the Elementary logo is gone and just before the Elementary welcoming screen, I can see the old red Ubuntu 14.04 login screen for a millisecond. What can I do? What may I have done? How to log back as the admin?