Which version of *ubuntu are you running, when you create your USB boot drives? Is it a version before 16.04 LTS? In that case I think there is an old and buggy version of the Startup Disk Creator, that you should avoid :-)
A new robust *cloning* version of the Startup Disk Creator was bundled with Ubuntu 16.04 LTS.
-o-
I'm glad that you have a version of Disks, that can do the job :-)
@Ken T (professorsnapper),
Which version of *ubuntu are you running, when you create your USB boot drives? Is it a version before 16.04 LTS? In that case I think there is an old and buggy version of the Startup Disk Creator, that you should avoid :-)
A new robust *cloning* version of the Startup Disk Creator was bundled with Ubuntu 16.04 LTS.
-o-
I'm glad that you have a version of Disks, that can do the job :-)