I recently performed a reinstall of Ubuntu 14.04.3 on my hard drive. All of my files were salvaged, but I'm having some issues that I didn't have before with my root directory. I'm trying to change the default OS in the boot menu (I was able to choose Windows before the reinstall), but now I'm trying to go about it in the same way and I'm being blocked by permissions.
I tried following the directions here so that I could hopefully use sudo to circumvent the permissions, but when I try and open /etc/default/grub with it, I end up opening a blank page instead of the actual file I'm trying to edit.
default
(defualt
) in your title here: perhaps you did the same on the command line?