I've also meet this bug and found workaround when looked in brasero-
session.log:
Brasero md5sum plugin is buggy - disable it, then you can burn a CD/DVD
ISO image :)
** Changed in: brasero (Ubuntu)
Status: New => Confirmed
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Brasero cannot burn a CD ISO image to DVD+RW
https://bugs.launchpad.net/bugs/199561
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