[ubuntu] Can use exactly one CD/DVD per boot

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http://ubuntuforums.org – Please help. I've been searching and searching (must not be figuring out the right search terms) and I can't find a solution to my issue. The problem is that I can only use one CD or DVD per boot. Example: - reboot - open DVD drive tray - insert disc - use disc normally - eject disc - close empty tray - now, I can NEVER get the tray to open again until I reboot, hardware eject button on drive doesn't work, can't get the eject command to work I've tried variations of the eject command: - eject - eject -r /dev/sr0 - sudo eject -r /dev/sr0 - eject -r - gksudo eject /dev/cdrom (Hardware)