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This question involves 3 (!) operating systems, so I hope I'm asking at the right place.

I'm trying to write an Ubuntu ISO image on a flash drive, to be used on a Lenovo PC laptop. I am using a MacOS computer to burn the ISO file with unetbootin, following the official instructions.

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The process ends with success, but the Flash Drive is not bootable - when I choose the right option form the boot menu, it tries to read it but quickly fails back to the existing GRUB screen on the Lenovo.

Any idea what am I doing wrong? Can I write an ISO image for a PC using a Mac?

Adam Matan
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  • Are there any errors? – zondo Apr 06 '17 at 19:07
  • Is PC UEFI? If so you need the 64 bit version and -i386 is the 32 bit version for very old or very lightweight systems. Almost all systems in last 10 years are 64 bit and last 5 years UEFI. – oldfred Apr 06 '17 at 19:16
  • @zondo No errors – Adam Matan Apr 06 '17 at 19:19
  • @oldfred Good point - Downloading the x64 now. Any idea how to make sure the disk is bootable? Is it simply about placing the files there, or do I need to make some format / partition change? – Adam Matan Apr 06 '17 at 19:23
  • Is PC UEFI? If so there is a simple way to make a UEFI only bootable flash drive. You just need it to be FAT32 with boot flag & extracted copy of all files from ISO. UEFI boots from /EFI/Boot/bootx64.efi which will be there. All the other install apps do that but then also add syslinux for BIOS boot. Do not know if Mac is same or not. http://askubuntu.com/questions/395879/how-to-create-uefi-only-bootable-usb-live-media – oldfred Apr 06 '17 at 20:36

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