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I had Windows 7 and Ubuntu 10.04 working in prefect harmony on a dual boot system, where Win7 was the default OS. This was until I let Ubuntu upgrade itself to 11.04. Ever since that, the default OS is now Ubuntu. I entered Startup Manager from Ubuntu and changed the default to Win7, but still - effectively whenever I reboot Ubuntu starts up. When I enter Startup Manager again it seems as if Win7 is the default...

What should I do?

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Have you got separate HDD for each OS? Are you using GRUB for boot? Include a photo/screenshot, and give more details! – antivirtel Jul 25 '11 at 9:54
have you looked at the questions over there? -----> – Uri Herrera Jul 25 '11 at 10:06
And you? He had no words about HDD, Grub. I can imagine the issue in min. 2 cases! – antivirtel Jul 25 '11 at 16:18

If possible, edit the /etc/default/grub Grub2 configuration file manually and change the value at the GRUB_DEFAULT setting.

For details see the Ubuntu Grub2 help page.

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