[ubuntu] Winodows ubantu dual boot, ubantu not working after install Xp

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http://ubuntuforums.org – Hi, I am using ubantu and windows as dual boot for quite some time, just before I have reinstalled windows xp and after the installation is completed I am not able to see the boot menu Its always loading into windows XP I am confident I have not deleted or formatted the ubantu partition. Any help would be more helpfull. (Hardware)