I have tried installing Ubuntu from a DVD for like 3 times. Every Time is completes successfully. After Successful installation it tells me to remove the DVD and restart my Computer. After restarting it directly starts windows 8. I thought the problem maybe of default OS. So i read the guide on the Microsoft site about changing the default OS. Here is the link.
But I couldn't see Ubuntu in the Boot menu in System Configuration. I have tried searching for answers but I couldn't get the answer. Please Help me. My laptop config is i5, 1TB Hard Disk, 64 bit OS and 4gb RAM. I don't think the laptop config is the problem.