dmg first, while this set of instructions from OSX Daily does not do this. However, I'm a bit confused since this one says that you must convert the. I've found two sets of instructions on how to do this. I intend to create my bootable USB stick with the DD command in the Terminal. Right now I'm on an old Mac running OS10.6.8 (Snow Leopard). I'm going to install a Linux distro (either Ubuntu Mate or Debian) on my next computer.