When starting K3b in Debian10/KDE (at version 18.08 there) I get this error:
Unable to find dvd+rw-format executable
K3b uses dvd+rw-format to format DVD-RWs and DVD+RWs.
Solution: Install the dvd+rw-tools package.
The dvd+rw-tools is installed. I have found some very old reports of this from 2004 and 2008 so I thought it got fixed by now.
How to fix this problem?
I also had this error when trying to burn to a DVD: "Could not determine size of resulting image file." and:
/usr/bin/genisoimage: Missing pathspec.
Usage: genisoimage [options] -o file directory ...
in the debugging ouput. I solved this by making more space available for the /tmp directory. (It didn't say that there was too little disk space in the errors and I didn't get notified about disk space running out there.)