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I have a dell 15r 5521 laptop.It came pre-installed with windows 8.I want to dual boot with ubuntu 13.04.I created a bootable usb and booted from it.selected try ubuntu.Opened terminal and typed "WINOSDATA=true ubiquity"(this is so that i get the option of install alongside windows)The ubuntu installer runs after executing this command. After sometime is displays "grub install dummy failed,this is a fatal error" and aborts.Please help

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