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I have installed Ubuntu 11.10, Linux Mint and Windows 7 in my system. I tried to set Windows 7 as my default OS but Linux Mint remains as default. I tried to change the order through StartUpManager in both Ubuntu and Linux; but no use. What can be done?

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Which OS bootloader are you using? Ubuntu and Mint should both use Gnome whereas Windows 7 has a proprietary loader that should be fairly distinct. – Garrett Dec 15 '11 at 5:02
@gman: I think you meant to say GRUB instead of Gnome. – Justin Pearce Dec 15 '11 at 5:10
You are correct -- this grey stuff between my ears keeps getting in the way of my thoughts! – Garrett Dec 15 '11 at 5:36

Find out which OS last installed (overwritten) the boot loader and configure default from there, using GUI (which you tried already) or config files.

Judging from the fact that Linux Mint is default, boot loader was probably installed from there. Mint is Ubuntu's clone, you might use the following page for info:

By the way, they're both Linux, not "Ubuntu and Linux" as you wrote. :)

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