If you've got a UEFI system then you should have EFI System partition (/boot/efi) that grub can write to (it's just FAT). Noticed that Fedora now makes a symlink from /boot/grub2/grubenv to /boot/efi/EFI/fedora/grubenv. This worked for me on Ubuntu 15.04 so presumable the symlink patch is present:
cd /boot/grub
sudo mv grubenv ../efi/EFI/ubuntu/grubenv
sudo ln -s ../efi/EFI/ubuntu/grubenv
If you've got a UEFI system then you should have EFI System partition (/boot/efi) that grub can write to (it's just FAT). Noticed that Fedora now makes a symlink from /boot/grub2/grubenv to /boot/efi/ EFI/fedora/ grubenv. This worked for me on Ubuntu 15.04 so presumable the symlink patch is present:
cd /boot/grub EFI/ubuntu/ grubenv EFI/ubuntu/ grubenv
sudo mv grubenv ../efi/
sudo ln -s ../efi/