In GRUB Legacy, the _ directive defines the default operating system to boot. 2 years agoby Linux Questions In GRUB Legacy, the _ directive defines the default operating system to boot. › Category: Introduction to Linux I › In GRUB Legacy, the _ directive defines the default operating system to boot. Vote Up 0 Vote Down Linux Questions Staff asked 2 years ago In GRUB Legacy, the _____ directive defines the default operating system to boot. system= boot= default= grub= Please login or Register to submit your answer Username or Email Address Password Remember Me FacebookXGoogle+PinterestLinkedIn