Yes, you can create /etc/default/grub yourself, it's not there by default. "quiet splash" are kernel/boot parameters, not grub options. It's a bit confusing but those two "quiet" are two different things.
Yes, you can create /etc/default/grub yourself, it's not there by default. "quiet splash" are kernel/boot parameters, not grub options. It's a bit confusing but those two "quiet" are two different things.