I installed Ubuntu 12.04 from Windows 7 via windows installer. It completed (I guess) successfully.
The problem occurs when I start Ubuntu. Neither mouse nor keyboard work (both usb). I can't type in the password.
Sorry if the question is a duplicate.
update: Keyboard and Mouse work on USB 3.0 ports but not on others. What should I do? I don't want to waste 3.0 on keyboard and mouse.