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You have to give VB the access to your DDP folder. Then open a terminal and navigate to this folder and type the command given. I cannot help you further as I'm not using VB with Ubuntu.

You can create an ISO file from layer0 and layer1 *.DAT files with cat program on Linux: cat layer0/IMAGE.DAT layer1/IMAGE.DAT > DDP.iso If your DVD is mastered with copy protection, sector size is set to 2054 bytes. You will not be able to mount the iso file nor to play it properly with VLC but imgburn will be able to burn it on the fly.