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[ubuntu] can't boot to Windows 8 after Ubuntu installation

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http://ubuntuforums.org – I just bought a a Samsung series 5 Ultra laptop (NP520U4C-A01UB). I was able to disable the secure boot feature in the bios and install Ubuntu 12.04 (as dual boot with Windows eight). Ubuntu works fine, but I can't boot to Windows in Grub. I get the following messages: Code: error: unknown command 'drivemap' error: invalid EFI filepath Does anyone know how to fix or work around this? (Hardware)