Package gnome-multi-writer

Write an ISO file to multiple USB devices at once

https://wiki.gnome.org/Apps/MultiWriter

GNOME MultiWriter can be used to write an ISO file to multiple USB devices
simultaneously.

General Commands (Section 1)
gnome-multi-writer
This manual page documents briefly the gnome-multi-writer command. gnome-multi-writer allows you to write a single ISO image to multiple USB disks at once.