Cheat sheet: How to create a bootable USB key on Mac OS X for Ubuntu / Debian

Open a terminal. BEFORE inserting the USB key, check which disks are available:

You should see one or more disks installed on your system like this:

Insert the USB key. Do a "diskutil list" again. You should see one more disk. This is your USB key. Let's assume it is /dev/disk2. First we need