I just bought this computer and it is my first try at doing this task.
I'm trying to create an bootable DVD on my HP 8470P. Below is a screen shot of what I am seeing. Tried three different blank DVDs with the same result.
I am using Caja>right click on image file>Open with>Disk Image Writer
The error message popped up first, I started Disks to find further info.
I wouldn’t bother reporting your situation. It has nothing to do with Caja but perhaps with (gnome) disks.
I don’t know as I’ve never installed whatever you expected to use to write an iso to a DVD. I used a variety of disc writing tools before the advent of USB flash (thumb) drives. Glad you got it sorted Fred.