Try the search box at the top right. With the way this is worded it sounds like it's not a real question.
– RobotHumansApr 20 '13 at 17:22
Could you be more specific? By providing more details about the problem you are facing you help the community to help you.
– Stef KApr 20 '13 at 17:39
1
Does the computer give you a choice of OS to boot? How did you install Ubuntu? Did you install it alongside windows?
– JayApr 20 '13 at 17:42
possible duplicated: [How can I repair grub? (How to get Ubuntu back after installing Windows?)](http://askubuntu.com/q/88384/62483)
– LucioApr 20 '13 at 17:47
From the [FAQ](http://askubuntu.com/faq): When you post a new question, other users will almost immediately see it and try to provide good answers. This often happens in a matter of minutes, **so be sure to check back frequently** when your question is still new for the best response.
– Apr 20 '13 at 17:51
@Lucio: I think the OP is having the opposite problem - booting Windows after installing Ubuntu.
– Nathan OsmanApr 20 '13 at 20:31
@NathanOsman I know, but many users (me inclusive) has **repaired the GRUB** with some of the answers there. I know that the title can confuse a bit, but some times, it doesn't differ if you installed Ubuntu or Windows the last time.
– LucioApr 20 '13 at 20:38