I had the same problem with Komplete 6 on Ubuntu 8.10. It turns out the DVD is being mounted as UDF but must be mounted as ISO9660 to work. This is how I made it work: 1. Make sure the first DVD is in the drive 2. Open a terminal and become root 3. umount /media/cdrom0 4. mount -t iso9660 /dev/scd0 /media/cdrom0 5. Close the root shell 5. Try launching the installer now The DVD should now be mounted as ISO9660. If this doesn't work then go verify the device /dev/scd0 and mount point /media/cdrom0 are correct. On your computer the logical device numbering may be different.
