Change default Operating System at boot
To change the Operating System which starts by default when booting, it is necessary to edit the configuration file for booting.
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Make a backup of your boot configuration file, and open it in a text editor:
sudo cp /boot/grub/menu.lst /boot/grub/menu.lst_backup gksudo gedit /boot/grub/menu.lst
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Find this line:
... default 0 ...
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Replace with the following line:
default X_sequence
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Save the edited file (an example)
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