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[xubuntu] boot problem after running xubuntu live

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http://ubuntuforums.org – My laptop have windows and ubuntu 12.04 dual boot. I try to install xubuntu to replace ubuntu. I go back and forth in the installation program try to decide what to do, then a error message show up something about unmount sba. I don't know what to do so I went to the menu and choose shutdown the computer. I figure I did not start the installation yet so things should be ok. After restart, when I run the installation program, the live CD did not detect Ubuntu and only detect Vista. so I stop the live cd and restart to GRUB. Everything still listed on grub, I can still start vista. But (Hardware)