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My system is running xubuntu.

When I try to install another os via usb or livecd specifically (Linux in usb, windows in cd), I keep 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.

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Welcome to askubuntu! It sounds like you are experiencing hardware failures of some kind. Let's confirm. When running Xubuntu can you open and see the contents of the removeable media that you are trying to boot from? Please help us help you by providing more complete information. –  Elder Geek Jun 18 at 14:10

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