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My system is running xubuntu.When I tried to install os via usb or livecd separately(Linux in usb, windows in cd),getting the message from system:

Reboot and select proper boot device or insert boot media in selected boot device. I have set the usb or dvd the first boot item,and the usb and cd is bootable in another computer,even the usb and cd is bootable in this computer before installing xubuntu.

How I solved it?thanks

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