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I've just installed Ubuntu 11.10 x64 on a 200Gb partition of my 2Tb external usb HDD. Everything went smoothly. After restarting the computer, I tried hitting F12 and choosing usb hdd. Something like 'Loading operating system' showed up, then it booted into windows. What did I do wrong?

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Check this thread:… – jippie Apr 21 '12 at 9:25
Mine doesn't boot even when I disconnect the internal HDD, so I doubt that's the problem. I'll use the code you wrote and give the results. – Oguzhan Apr 21 '12 at 9:49
Since I can't boot into the system, I had to do it by booting from installation USB. It gives some error like 'Cannot find /boot/grub/menu.lst' – Oguzhan Apr 21 '12 at 10:03
I had a similar problem, the message was No boot sector on USB device. See my answer in this other thread to fix it, which (re-)installs grub onto the USB drive after installation. – FriendFX Sep 27 '13 at 13:58

Try setting your external hard drive as primary boot device instead of the F12 boot menu option.

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Tried it, didn't work. Same thing happens(loading operating system->Windows). – Oguzhan Apr 21 '12 at 13:36

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