Ubuntu – Create bootable USB stick on macOS – stick does not appear as bootable

bootsystem-installationusb

I would like to erase the existing operating system and install Ubuntu on my Macbook6.1.

I am following this tutorial to create a bootable USB device.
But my USB stick does not appear as bootable device in Apple's 'Startup Manager' on step 7.

I set the format to MS-DOS (FAT) and the scheme to GUID Partition Map when preparing my USB stick on step 3.

I tried with the 18.04.1 and the 12.04.5 releases, and I tried using Etcher (as in the tutorial) and UNetbootin to install the disk image on my USB.

I am using a mid-2014 Macbook Pro to prepare the USB stick.

Best Answer

I finally managed to boot from the USB using rEFInd.

I found rEFInd here. I installed it in the original OS on the Macbook6.1 by running the install-refind script.

More information about refind here.