Cook the linguine according to the package instructions until al dente. Drain and set aside.
In a large skillet over medium heat, add the ground beef and cook until browned. Drain excess fat.
Add minced garlic to the beef and sauté for about one minute. Incorporate brown sugar, beef broth, soy sauce, hoisin sauce, ground ginger, ground black pepper, and red pepper flakes; stir well.
Mix cornstarch with water until smooth to create a slurry. Pour into the skillet and stir until the sauce thickens, about 2-3 minutes.
Gently fold in the cooked linguine until well coated in the sauce.
Transfer to serving dishes and garnish with sliced green onions before serving hot.