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I followed this question (How to create a bootable Ubuntu USB stick Using OS X 10.10.2) to turn the Ubuntu 14.04 ISO to a bootable USB.

I have a MBP (with touchbar) running 10.12.5.

After rebooting while pressing the option key, I don't see the USB drive listed. I only see the SSD listed.

What could be wrong?

Update

The comments suggested my Partition Map was not of the right type. So I erased the USB using Journaled option and select GUID Partition Map. After it's completion (verified with Diskutil list) I rebooted to see that the USB is still not listed as a bootable option.

Any other ideas?

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    It's important to make sure the USB disk is using a GUID Parition Table (GPT), as this is the format that both macOS and Linux boot disks use. If you formatted it using either Master Boot Record (MBR) or Apple Partition Map (APM) the disk will likely not show up in the list of boot disks. Please check which partition map the USB disk is using (Disk Utility>USB Disk>Info). If its using the wrong map, try erasing the disk and setting the map to GPT. If it's already using GPT then additional options might be needed when writing the image to disk. – Alison E.E. Jul 3 '17 at 22:15
  • Cool will check. This seems like an answer rather than a comment to me :) – Shaihi Jul 4 '17 at 6:19
  • It seems that after I use the dd command the partition map changes to Apple_Partition_scheme :( - is it wrong usage of the dd command? – Shaihi Jul 5 '17 at 8:44
  • Nope, it seems like you're using the command correctly. My guess is that the image you're writing is formatted as Apple Partition Map because it's meant for use with older Power PC Macs. It's also an important point that when writing a Linux image to a USB device on macOS Disk Utility will usually claim the drive isn't readable to the computer if it burned properly. Does the version of Ubuntu have to be 14.04? If not I can look around and find another image. – Alison E.E. Jul 5 '17 at 21:43
  • Here is a link to the default Ubuntu 16.04LTS image. Newer Macs generally don't require special versions of Linux installers anymore, so it should work just fine. Same as last time make sure the disk is formatted GPT with HFS+ before writing, and just dd or dcfldd it to the disk like any other image. – Alison E.E. Jul 5 '17 at 21:59

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