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How do I remove GRUB? I'm asking because I'm using a MacBook Pro and when I boot my computer, it asks me first to choose from OS-X or Ubuntu (through Apple’s EFI-bootloader) and the second time through Ubuntu’s GRUB bootloader.

Any tips for how I can fully disable GRUB?

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You can make GRUB not appear and simply boot your first OS choice by setting GRUB_TIMEOUT=0 in /etc/default/grub.

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