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I just installed Ubuntu 12.04 on a Dell Inspiron 6400 and tried to enable playing of encrypted DVD's, I made sure libdvdread4is installed and got myself regionset via apt. When I try running it however it tells me

regionset version 0.1 -- reads/sets region code on DVD drives ERROR: Could not open disc "(null)"! Please ensure there is a readable CD or DVD in the drive.

I tried this as root, as non-root, with an actual encrypted DVD and also with a "normal" cd with some pictures on it. They both get automatically mounted.

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up vote 1 down vote accepted

You might need libdvdcss - and you can get that easily. Just follow the instructions here:

Or, add the Medibuntu repos and install it from there:

sudo -E wget --output-document=/etc/apt/sources.list.d/medibuntu.list$(lsb_release -cs).list && sudo apt-get --quiet update && sudo apt-get --yes --quiet --allow-unauthenticated install medibuntu-keyring libdvdcss && sudo apt-get --quiet update

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Thanks for the answer, I checked, libdvdcss was and is installed and the newest version. The problem persists – tannerli May 9 '12 at 17:06
Had the same problem once... can't remember what I did to get it to work, though. The only other advice I can give you is that you might try installing the ubuntu-restricted-extras package, and remember that not all DVD's work with libdvdcss. – Richard May 18 '12 at 2:00
That actually did it, well kinda... regionset still fails, but DVD works now so.. problem solved :) Thanks – tannerli May 19 '12 at 11:35

I know I'm a a couple years late, but I just had this exact problem. In my case that error meant regionset couldn't find the DVD drive. The solution is to tell it where to look.

On my computer that was:

sudo regionset /dev/sr0
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