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i'm using dual boot and i want to use windows 7 as the default operating system.So how can i change default OS of GRUB Boot loader?

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2 Answers 2

Reset to default
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use grub-set-default

$ sudo grub-set-default ENTRY

ENTRY is a number or a menu item title

or edit /boot/grub/grub.cfg

sudo chmod +w /boot/grub/grub.cfg
sudo vi /boot/grub/grub.cfg 
   change "0" in line: set default="0" to your choice
sudo chmod -w /boot/grub/grub.cfg
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    It would be a better idea to edit /etc/default/grub and run 'update-grub' afterwards. /boot/grub/grub.cfg is not meant to be edited.
    – nick
    Commented Jan 28, 2015 at 18:34
  • It would be good to note that the entry list can change so you may need to do this again later. The other option would be to write out the entry rather than using the index number. Example: GRUB_DEFAULT="Windows Vista (loader) (on /dev/sdc1)"
    – Gibado
    Commented Oct 12, 2016 at 2:36
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How do I set Windows to boot as the default in the boot loader?

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How do I set Windows to boot as the default in the boot loader?

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