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21.7. 3. Resetting and Reinstalling GRUB 2
- Run the rm /etc/grub.d/* command;
- Run the rm /etc/sysconfig/grub command;
- For EFI systems only, run the following command: ~]# dnf reinstall grub2-efi shim.
- Rebuild the grub.cfg file by running the grub2-mkconfig -o command as follows:
How do I change the default boot in grub2?
1 Answer
- Open a terminal window and execute: sudo nano /boot/grub/grub.cfg.
- Enter your password.
- In the file opened, find the text: set default=”0″
- Number 0 is for the first option, number 1 for the second one, etc. Change the number for your choice.
- Save the file by pressing CTRL+O and exit by pressing CRTL+X .
How to correctly set up the right GRUB 2 default?
To select a menu entry under the sub-menu “Advanced options” set GRUB_DEFAULT=”1>3″. You can now run grub2-mkconfig to generate the grub config file. On the next reboot vmlinuz-3.7.4-gentoo-5 should boot. Note: This won’t change the default entry in the grub menu, i.e., the default entry will still indicate the same entry as you have right now.
How to change the Grub boot menu order or default boot entry?
To change the GRUB boot menu order using Grub Customizer, go to the List configuration tab, select a boot menu entry and use the up and down arrows to change its position: Instead of changing the GRUB boot menu order, you can also change the default OS (default selected boot entry).
Which is the default image in Grub menu?
On the next reboot vmlinuz-3.7.4-gentoo-5 should boot. Note: This won’t change the default entry in the grub menu, i.e., the default entry will still indicate the same entry as you have right now. But the image which will be booted by default will be the 4th image under the “Advanced options”.
Where is the DEFAULT entry in Grub stored?
Following is the manual way. In grub (before version 2, actually it is usually version 0.99), the default entry is stored in /boot/grub/grub.conf. The default entry to boot is specified by the ‘default’ variable such as The ‘2’ here is to set the default entry to be the 2nd (start from 0) one.