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I dont know how to dualboot the system. I can only change the boot option in BIOS and then boot either windows or linux. When I have set a Linux boot option and after starting a computer i choose to click on windows8 an error shows up: error: unknown command 'drivemap' error: invalid EFI file path

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you have to turn off fast boot and disable secure boot before installing Ubuntu alongside Windows 8.

This is a great tutorial to learn from.

If you need more help just ask :)

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