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bbfa235
(Get the code!)
I had the same problem and I would like to share my solution.
First, I use a rather old Wortmann Terra machine with openSUSE 42.3 and Windows 10. The USB stick is a used Intenso Alu Line 8 GB.
I prepare the stick with GParted (1 partition, file system: fat32, flags: boot, type).
Then with UNetbootin (Version 0.0.613-7.1 from the openSUSE 42.3 repository) I write a downloaded iso image of Ubuntu 18.04 to the stick.
When trying to boot from the stick I get the message "This is not a bootable disk. Please insert a bootable floppy and press any key to try again...". The problem is the same if I first write the iso file to the stick and then set the boot flag in GParted.
Solution:
In GParted I set the boot flag and then format the stick with file system ext4 instead of fat32. Then with UNetbootin I write the iso image again to the stick. Now it works!