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How to remove the unwanted entries from the boot menu?

I guess I've got more than one ubuntu installation (either two or three) along with a windows 7 installation. Each of the ubuntu installations also list something extra (maybe like a safe mode?) within grub.

Firstly, how do I remove the ubuntu installations I don't use? (how do I first identify the one I do use? I log into it after booting it, but how do I delete the others)

Also, how do I leave just a Windows 7 option and an Ubuntu option?

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Duplicate of: How to remove the unwanted entries from the boot menu? –  Sid Jan 16 '11 at 22:27
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marked as duplicate by Stefano Palazzo, Jorge Castro, Nathan Osman Jan 17 '11 at 0:49

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1 Answer

just edit the file menu.lst located at /boot/grub

but first you have to create a backup of this file using for example this command

# cp /boot/grub/menu.lst menu.old
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