How can I create an Ubuntu bootable USB to boot on a Windows 10, using a MAC running El Capitan? I tried using Unetbootin running on Mac (El Capitan), however my USB is not recognized! Also tried Disk Utility with no success. How to do it?
2 Answers
First make absolutely sure that the USB key is not mounted (if it is, unmount it). Next you should use
sudo diskutil list
To see if the USB key shows up. If it does, then the "problem" is that it isn't formatted. This is not actually a problem, you can proceed to use it.
If the USB key does not show up, there may be driver or hardware problems. In either case, it's probably simplest to buy a new, working USB key.
Once you have a working identified USB key you can use a command like
sudo dd if=./xbmc-9.11-live-repack.img.dmg of=/dev/rdisk<NUM> bs=1m
where is the number of the disk that diskutil shows you. Be very careful not to use one of your other disks where you might cause damage.
Here's a blog posting with a more extensive explanation of the procedure

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I assume by "boot on a Windows 10" the original poster means "boot on a PC" and not boot inside a virtual machine. Can't comment to the question yet though. – Michael Jul 24 '16 at 15:26
I'm just wondering, why insist on creating the stick with the Mac, when it's probably just a couple of minutes to do it in W10? Or did it fail on the W10 machine too?
If El Capitan refuses to give you access to the stick, a long shot is to install a VM and install Linux on the Mac and try from there.
Edit: A friend of mine reported problems with an El Capitan upgrade. So I ran into the following website to activate USB ports after the upgrade. Perhaps that helps. http://www.insanelymac.com/forum/topic/306777-guide-usb-fix-el-capitan-1011/

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sudo dd
. Be extra careful to specify the right block device, or else REALLY bad things will happen. – You'reAGitForNotUsingGit Jul 24 '16 at 14:51