1. In a Terminal window, show the attached drives.
diskutil list
2. Unmount the drive you are wanting to load Linux to.
diskutil unmountdisk /dev/disk2
3. Use dd to copy your ISO to the drive. The transfer will likely take a while. Be patient.
sudo dd if=/path/to/ISO/ubuntu-20.04.2-live-server-amd64.iso of=/dev/disk2 bs=1
if= declares the input file.of= declares the output location.bs= sets the input and output block size.4. When the transfer is finished, you will return to your command prompt and a window will likely appear asking you what to do with the drive. Select ‘Ignore’ and unplug the drive.