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I recently delate the boot folder on Ubuntu 12.04. The ubuntu is installed on a San Disk 16G. When i start it just appeared a black window of grub. All I know is that on the boot folder it was an another folder called grub and 4 kind of files that had the name like "initrd3.5.0.31" whith other four. When I started whith my usb it appeard me that one, and another (that where the images of the computer and another images o the USB)

I just need a boot folder or the instructions to install them on my USB


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