Grub theme won't change despite following a tutorial

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That command will work, but after running it then it must be manually repeated with EVERY kernel update.

Several releases back fedora modified grub and made that file (/boot/efi/EFI/fedora/grub.cfg) a pointer file that redirects grub to the actual grub.cfg file located at /boot/grub2/grub.cfg. Normal updates no longer modify that file in any way so once one has modified it the automatic updates done with a kernel install do not touch it.

Recovery is fairly simple.

  1. sudo rm /boot/grub2/grub.cfg /boot/efi/EFI/fedora/grub.cfg
  2. dnf reinstall grub2-common (or dnf reinstall grub2-*)
    This should recreate both the files removed in step 1
  3. reboot

Just so you are aware for future use the proper command to update grub.cfg is sudo grub2-mkconfig -o /boot/grub2/grub.cfg or as was already mentioned sudo grub2-mkconfig -o /etc/grub2.cfg.

Official documentation is here

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