Just a few steps. Let's start! this step without GUI Application 1. Open ur terminal (shortcut: CTRL+ALT+T) 2. type this command to let u know menu entry for ur grub grep menuentry /boot/grub/grub.cfg if ur laptop/pc dual booting with Windows, the output should be like this: know ur windows name: 3. make copy ur file with this command: cp /etc/default/grub /etc/default/grub.bak 4. edit ur default grub with run this command nano /etc/default/grub the output should be like this: focus on line below: edit like this: u can change grub timeout by replace this code: 5. save ur work and update ur grub with this command: update-grub and the output should be like this: and the last step is reboot ur laptop/pc reboot thanks for reading any question? just comment
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