Custom Grub Entries Don't Update


I’m looking to add a custom Grub entry for the sake of multi-booting. Unfortunately, when I attempted to do this, the grub fails to update. I followed this: Qubes OS 3.2 - part 11 - qubes windows 7 multi/dual boot with grub - YouTube and had succeeded in updating grub2.cfg (in /boot/grub2/ originally, then to make sure /boot/efi/efi/qubes), but when I rebooted, nothing changed.

I’ve looked around for an answer to this issue but couldn’t find one. Any idea how to fix this?


Are you using Legacy BIOS / UEFI ? and when you want to make change in your grub configuration, you should change in /etc/default/grub then write out with :

grub2-mkconfig -o /boot/grub2/grub.cfg for Legacy BIOS
grub2-mkconfig -o /boot/efi/EFI/qubes/grubx64.cfg for UEFI


I’m using UEFI. What changes would have to made to /etc/default/grub for new grub entries? I’ve worked through the documentation here: Working with the GRUB 2 Boot Loader :: Fedora Docs with seemingly no changes to the grub.