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Edit Grub Menu

Ubuntu uses Grub2 as its bootloader. If you have installed multiple operating systems on your computer, you may need to modify the boot order or remove certain boot entries.

There are two files you may need to modify:

  • /etc/default/grub: contains the default settings and configurations for GRUB
  • /boot/grub/grub.cfg: is the actual GRUB configuration file that the GRUB bootloader reads at boot time

If you modify /etc/default/grub, you need to run

$ sudo update-grub

to update the changes to /boot/grub/grub.cfg.

Typically, you may update /etc/default/grub to change:

  • whether to show the boot menu (GRUB_DISABLE_OS_PROBER)
  • timeout of the boot menu (GRUB_TIMEOUT)

You may need to update /boot/grub/grub.cfg if you want to change the boot menu entries. The following shows an example of the menu entry and submenu:

menuentry 'Ubuntu' --class ubuntu --class gnu-linux --class gnu --class os ...
submenu 'Advanced options for Ubuntu' $menuentry_id_option ... {
        menuentry 'Ubuntu, with Linux 6.5.0-35-generic' --class ubuntu ...

Typically you may comment out or change the order of the menus and submenus.