So I just wanna know why the drive only works on my pc and not every computer, I followed the video from hack 5 episode to the T. I dont think that guy is an expert because the way he stated some stuff sound weird and the installation doesn't seem perfect. I may be wrong, anyhow I saw someone talk about uuid i believe can anyone teach me how to do this?

objective: Make usb persistent drive (os is bt4 r1) boot on all pc's. I dont know how to change the grub file or the fstab ( dont even know what that is).