Linux has a 'command line' utility called cdrecord. Just type 'man cdrecord' at a prompt ... or 'info cdrecord'. I just say learn to use a command-line interface and get away from the GUI (does everything for me) way of doing things. GUI's are just wrappers around what's really going on.
here's what I do to burn an .iso
$ cdrecord -v speed=10 dev=0,0,0 somefile.iso
ofcourse ... by doing as Neo said above , you'll get the proper device numbers ... mine being 0,0,0 on cdrecord -scanbus
Peace