This question already has an answer here:

So I hava a TOSHIBA laptop (64 bit) with Windows 7 Home Premium. First I downloaded wubi.exe and I installed it to my laptop. The only problem with this when I start Ubuntu I always get an error: Prefix is not set.The ubuntu boot up succesfully after 1 minute but it is very slow. So I want to reinstall ubuntu from a CD. I burnt a Windows 7 Home Premium (english version) iso for a Verbatim DVD-R and an Ubuntu 12.04 (desktop edition) (amd64) iso for a Sony CD-R. Okay I'm a beginner. Please anyone write me the method step by step: how to dual boot Windows 7 with ubuntu 12.04 I have the Installation disks, what is the step 2?

marked as duplicate by blade19899, Florian Diesch, Lekensteyn, Aditya, user117103 Dec 30 '13 at 21:34

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

  • You'll find a complete guide on setting up a Windows/Ubuntu dual boot here askubuntu.com/questions/1366/… – user2405 Dec 4 '12 at 0:36
  • It's recommended not to use wubi, but allocate a separate partition for Ubuntu (this can be done from the installer CD or USB). – Lekensteyn Dec 30 '13 at 16:22

First install a clean Windows 7, and then follow these steps for your dual boot setup with Ubuntu 12.04:




  • So I'll do this: 1. Set BIOS to boot from a CD/DVD – xyc Nov 28 '12 at 20:19
  • If you think this answers your question, please mark it to "accept this answer". Thanks! – madjoe Nov 29 '12 at 15:08

Not the answer you're looking for? Browse other questions tagged or ask your own question.