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Execute sudo dd if=/path/to/downloaded.img of=/dev/rdiskN bs=1m (replace /path/to/downloaded.img with the path where the image file is located; for example, ./ubuntu.imgor ./ubuntu.dmg).

What does this mean example: in terminal I would type

sudo dd if=/Users/Me/Desktop/ubuntu.img of/dev/rdisk3 bs=1m/Users/Me/Desktop/ubuntu.img

is this correct or wouldn't be something different I don't understand the terminology

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Follow the instructions here:

You run the dd command in Terminal. As it notes, make sure you have the right disk (as it'll overwrite whatever is on there). If your disk is /dev/rdisk3, then the command is:

sudo dd if=/Users/Me/Desktop/ubuntu.img of=/dev/rdisk3 bs=1m
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