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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