Thanks for the tip about bashburn. I installed it with Gslapt. I attempted to configure it but most of it was beyond me. I then put in a video DVD and attempted to copy it.
There are no options that say "video DVD." It offers audio CD, data CD, and ISO. I tried to copy as a data CD, although it's not a data CD. The program said it wasn't mounted. When I verified that it was mounted, bashburn still said it wasn't mounted. Video DVDs don't have file systems like data DVDs.
I guess I'm still looking for a solution.
Maybe I should explain more about what I'm trying to do. I often record programs from PBS onto the hard drive of our hard drive/DVD recorder. Then I edit out pledge breaks, intermissions, promos for upcoming programs, etc., and burn the program to a DVD using the DVD recorder. I make a duplicate of the DVD as a backup. I do duplicate on a computer by copying one DVD to another.
K3B does this easily. Just tell it to copy a DVD. xfburn doesn't offer this option. It looks like Brasero would do it, but Brasero won't work on VL7. I'm trying to keep my VL7 installations free of KDE. So I have to start Windows and burn the copy there with Nero.
When I say I'm willing to copy a DVD from the command line, I mean somebody tells me "use this command" and then gives me the exact command. I don't mean I have to figure out what modifiers to use, etc. I don't understand any of the stuff underlying the front ends and I don't want to understand it. I just want to click on "copy the DVD" or type one command that I don't have to puzzle out.