generate bootable USB stick
convert ISO to IMG
hdiutil convert -format UDRW -o ~/path/to/target.img ~/path/to/ubuntu.iso
insert USB stick an list all devices
disktuil list
unmount USB stick
diskutil unmountDisk /dev/diskN
write IMG to USB stick 'rdiskN' is the numer of the disk
!! using /dev/rdisk instead of /dev/disk may be faster
sudo dd if=/path/to/downloaded.img of=/dev/rdiskN bs=1m
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