Six months later I've found out I have this bug too. My folder names don't have any special character but I moved it anyway to my home directory. Then I zeroed the first megabyte and format the drive to vfat. Only after all this 3 steps usb-creator allowed me to procede.
-- Fails repeatably with "DBus error org.gtk.Private.RemoteVolumeMonitor.NotFound: The given volume was not found" https://bugs.launchpad.net/bugs/458334 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs