I can make a live CD image from the original 16.04 ISO image following these instructions:
My "remastered" ISO boots fine using kvm.
When I use the original 16.04 source ISO in "startup disk creator", I get a bootable USB, of course.
However, when I use my remastered ISO with "startup disk creator", it does not result in a bootable USB (at least with the PC I'm trying to boot it with). I notice that the USB I get from my remastered ISO shows up as only (say) /dev/sdb, but a USB from the original ISO (same USB stick) shows up as: /dev/sdb, /dev/sdb1, /dev/sdb2
So, I'm guessing maybe this has something to do with UEFI. But how can I make a USB stick created from my remastered image bootable?