Kubuntu wont mount dvd rw after upgrade

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http://askubuntu.com – I recently upgraded to Kubuntu 11.10 from the previous version of Kubuntu. Everything went smoothly but now I'm unable to use dvd rw medium. It worked fine before upgrade. Now when I insert it nothing happens. I tried inserting normal dvd medimum ( which is full) and it work's fine. I saw that someone fixed this by downgrading to 3.0 from 3.1 kernel but my kernel version is 3.0.0-15-generic. Any suggestions ? Thank you. (HowTos)