How to GRUB Change Default OS on Fedora 40 – Step-by-step

Setting up

2. 2. Installing GRUB Customizer

   Then to Install GRUB Customizer in Fedora
   Simply run:

   sudo dnf install grub-customizer

   Authenticate with the User’s Admin Pass.
   If Got “User is Not in Sudoers file” then see: How to Enable sudo.

3. 3. Running GRUB Customizer

   Finally, Launch & Enjoy GRUB Customizer
   From Desktop Make Use of the Launcher:

   

   Or from Command Line with:

   grub-customizer

4. 4. Setting Up OSes Boot Order

   Finally, to Modify Fedora Linux 40 Boot Entries Order
   Choose the “General settings” Tab & “Default entry”:

   

   Finally Save & Exit:

   

Congratulations, your Fedora Linux 40 New GRUB Boot Order setup should be now nicely working!