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I want to remove all trace of multi-boot now and make Ubuntu boot up without grub that was installed when Windows 7 was there. Now Windows 7 is gone but not the boot menu.

How do I remove this?

marked as duplicate by Sylvain Pineau, Eric Carvalho, Fabby, Mitch Feb 20 '15 at 12:47

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Open a terminal and run the following command -

sudo update-grub

This will re-generate the grub config files so that only valid entries exist.

Note - You need a bootloader like grub or syslinux if you wish to boot into Ubuntu. Therefore, you must not remove grub itself, as suggested in the question.

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