Save a Default Operating System: If you choose GRUB_DEFAULT=saved, you also need to add a GRUB_SAVEDEFAULT=true line - otherwise it won’t work.Ĭhoose Whether GRUB is Hidden: With only one operating system installed, Ubuntu defaults GRUB to automatically boot to the default OS with the GRUB_HIDDEN_TIMEOUT=0 option. For example, if you had an operating system named Windows 7 (loader) in your OS list, you could use GRUB_DEFAULT=”Windows 7 (loader)” You could also use GRUB_DEFAULT=saved and GRUB would automatically boot the last operating system you chose each time you boot. By default, GRUB_DEFAULT=0 uses the first entry as the default - change the number to 1 to use the second entry, 2 to use the third entry, or so on. If it does, edit the existing line instead of adding a duplicate one.Ĭhoose the Default OS: Change the GRUB_DEFAULT= line. If any of the options below doesn’t already appear in the file, add it on a new line. As with any other configuration file, you need to edit the options to your desired state and then change the file. The /etc/default/grub file is short and should be easy to edit. You can use any text editor you like, of course - including the standard vi text editor. If you want to use a graphical text editor, open a terminal - or press Alt+F2 - and run the following command:įor an easy-to-use terminal-based editor - Nano - use the following command.

Open the /etc/default/grub file for editing in a standard text editor. RELATED: A Beginner's Guide to Editing Text Files With Vi In other words, to customize your GRUB2 settings, you’ll have to edit the /etc/default/grub file and then run the sudo update-grub command. When you run the update-grub command, GRUB automatically combines the settings from the /etc/default/grub file, the scripts from the /etc/grub.d/ directory, and everything else, creating a /boot/grub/grub.cfg file that’s read at boot.

How to change grub theme