this tutorial to change GRUB delay timing and boot session on dual booting 1. edit GRUB configuration file, /etc/default/grub , example # vim /etc/default/grub 2. to change GRUB time out, edit on GRUB_TIMEOUT (in second), fill with your time. 3. to change boot session booting, edit on GRUB_DEFAULT (first is = 0). please pay attention on what session your OS before apply any changes. 4. Save, recompile your GRUB by type this line below : # update-grub
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