Change the Grub Boot Order Ubuntu

GRUB can be configured using the /etc/default/grub file. Before you make any changes to it, it may be a good idea to back it up by creating a copy:sudo cp /etc/default/grub /etc/default/grub.bak

You can restore the copying the backup over the original:sudo cp /etc/default/grub.bak /etc/default/grub

Open the file using the text editor with root privileges:gksu gedit /etc/default/grub

The line GRUB_DEFAULT=0 means that GRUB will select the first menu item to boot. Change this to GRUB_DEFAULT=saved . This change will make it easier to change the default item later.

Save and close the file. Run this command to apply your changes to GRUB’s configuration:sudo update-grub

The configuration change we made allows the grub-set-default and grub-reboot commands to be used at any time. These allow you to change the default boot item permanently or only for the next boot, respectively.

Run grub-set-default or grub-reboot (with sudo) with the number of the menu item to boot (the first item is 0). This command will change the default to the second item:sudo grub-set-default 1

In the screenshot above, Windows Vista is menu item 5. If you want to select an item from a submenu like Previous Linux Versions, you can specify the position in the main menu, followed by a greater-than sign (>), followed by the position in the submenu. You can also name an entry instead of giving its position. There’s a Forum post about how this works. The Ubuntu Wiki also has more details on configuring GRUB.