Comment 9 for bug 205773

I had the same thing just now. I have Ubuntu server 8.04 sharing a partition via samba. I connected to the drive from "places->network" and browsing to it. I then put in a blank cdrom and tried to drag some files from the samba drive directly to the blank cd, the first folder copied, but as soon as it attempted to copy a file I got the "operation not supported by backend"

After trying a few more times, I copied the files from my samba drive to my desktop, then from the desktop to the cdrom worked just fine.