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I am trying to install Ubuntu alongside windows 7 but whenever i reach the part where you have to select "Install alongside windows 7" its showing "your computer doesn't have a installed OS,erase the disk and install Ubuntu"

I have windows 7 professional but its showing no operating system installed

Any comments!!

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You have to repartition your disk and install Ubuntu in manual mode. Here is the guide. And I made my own question for actual guide. –  Danatela Sep 9 '13 at 10:07

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