I sincerely hope some other poor soul gets some value out of this. Well, I spent a second whole day on it and now I've cracked it. If I can get this solved I will place a clear guide on the web somewhere!
Can boot, rEFInd loads, there is an option to boot ext2_圆4.EFI(?) but no Ubuntu/vmlinuz. Copied ext2_圆4 to /EFI/boot and /EFI/refind. Put rEFInd on a another, FAT32 partition which contains /EFI directory. USB disk has ext2 /boot partition (with vmlinuz image on it), and ext4 / partition with the rest of Ubuntu 14.04 installed. However, I think I must be close to cracking this and hope somebody can point to a step-by-step guide somewhere. I'm a bit stuck at this point, and the next steps will have to be a detailed study of bootloaders and EFI. I have an ext2 /boot partition on the same disk, and copied ext2_圆4.efi into the /EFI directory, but no go. So, I've managed to get rEFInd installed on a partition on the external drive but it does not detect the Ubuntu installation. However, the common thread appears to be using rEFInd to rejig the boot options. I have Googled extensively and I'm sure it's possible to get the Mac to boot it, but the instructions I've found have been either too vague ( Installing Ubuntu on and External Hard Drive and boot in a Mac) or in one case, too complex ( ) to make much sense. However, contrary to some assertions here and elsewhere, after restarting the result is not detected by the Mac as bootable. I can easily create a bootable USB stick and use that to install Ubuntu 14.04 onto a properly partitioned USB device. Write warnings.I wish to run Ubuntu on my iMac from external USB storage, either an external disk or a flash drive. Perform the following to configure your USB device in Rufus: Boot selection and Partition scheme. With a bootable Ubuntu USB stick, you can: Requirements. How do I create a bootable USB drive for Ubuntu? 
How can I make a bootable USB for Windows 10?. How do I make a bootable Ubuntu USB for Mac and PC?. 
How do I create a bootable USB drive for Linux?.How do I create a bootable USB drive for Ubuntu?.
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