[kubuntu] CD/DVD drive won't eject disc with Kubuntu 12.04

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http://ubuntuforums.org – I have an older Gateway computer with a CD writer/DVD player installed, and I just started using Kubuntu 12.04. After I insert a CD or DVD, I'm unable to eject it with the button on the drive. It sounds like it's spinning in there without stopping even though I'm not running the disk in a program. The only way I seem to be able to remove it is by restarting the computer and removing the disk as the computer boots up. I've been running standard Ubuntu 12.04 on this computer until recently, and never had this issue. Any thoughts? Thanks! (Hardware)