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I'm trying to dual boot ubuntu 11.04 with windows 7. In the installer, there's supposed to be a "run alongside something else" option for dual booting. However, it says that no operating system are detected. Anyone know how to fix this?

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You need to have a bootloader (grub or something else) – soandos Aug 1 '11 at 8:13
please give more details--what were the steps you took to install the first OS, then the second OS. – Jim Syyap Aug 1 '11 at 8:25
Okay. This computer came with windows 7 on it. I downloaded ubuntu 11.04 onto a DVD-RW. I boot the computer from the DVD to start the ubuntu install process. – Jess Aug 1 '11 at 8:28
Is it booting from the right device? May be an idea to check in BIOS – admintech Aug 1 '11 at 9:28
try this--run ubuntu live cd (not install). Run GParted. Post what you find in there. – Jim Syyap Aug 1 '11 at 9:43

You can simply install Ubuntu 11.04 from Windows using Wubi, no need to boot from the disc.

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