The solution to my problems with usb-creator was to use a combination of
the above:
1) Formatting the USB drive with Gparted made the drive usable by usb-
creator (as sdb1)
2) Moving the image to my home directory made the file readable by usb-
creator (I also had a folder with utf-8 characters)
To elaborate futher:
1) fixed the DBus error org.gtk.Private.RemoteVolumeMonitor.NotFound: The
given volume was not found error
2) fixed the Installation failure error
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Fails repeatably with DBus error org.gtk.Private.RemoteVolumeMonitor.NotFound:
The given volume was not found