Where is the USB stick formatter, and the USB Iso Writer in Budgie and Gnome? I have tried the search box in menu.
I cannot find it the repository either (except for a Multi ISO Writer).
USB Format and USB Image Witer
- Edited
spaarks it's a part of Disks. if you right-click an ISO file in the file browser (Nautilus) and pick "Open with other application -> Disk Image Writer" it'll pop up. 
in Disks itself you click the right-hand "..." titlebar button and pick Restore Disk Image.
In addition to synth-ruiner 's ideas.
*Brasero is great if burning to DVD/CD.
*Gnome-disks formats for me fine, but I screwed up the .iso. Play with it.
*I .iso without GUI with the DD command always with success (https://getsol.us/articles/installation/preparing-to-install/en/)
2 cents
brent good suggestions. etcher is available in the repos as well and is very easy to use.