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I want to boot Ubuntu on my mac air(2010) using my external 1TB drive.

I converted the install to .img fine in Terminal. Now i need to make a bootable usb drive to install

I tried to do the sudo command but it told me my device cannot be read by this computer after it waited a few minutes.

I then tried unetbootin. But it says the bootable usb device cannot be used on a mac. I just want to get Ubuntu.

This is the error I get when I get trough step 9.

The disk you inserted was not readable by this computer.

Everything else works great, until here.

I took a chance and plugged in the USB drive unetbootin said could not be used to boot, well it does work. I did the trial, then successfully installed Ubuntu on the external drive partition.

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How to install Ubuntu on MacBook using USB Stick has Mac-specific, step-by-step instructions on USB Flash Drive preparation as does Installation/FromImgFiles. Please try that on your external drive as if it was a flash drive, and let us know if there's a problem by editing your original question and copying the error message into the question.

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