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startup disk creator error "unable to mount blank DVD-R Disc location is already mounted"

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http://askubuntu.com – My os is ubuntu 12.10 32 bit desktop. (Pentium(R) Dual-Core CPU E6500 @ 2.93GHz × 2) . When trying to burn the lubuntu-12.10-desktop-i386.iso file on a blank DVD-R Disc, using the startup disk creator, I get this error: unable to mount blank DVD-R Disc location is already mounted. I have never encountered such problem before. What is wrong and how to correct it? (HowTos)