Playing DVD iso files (images)

Well, it took me about two hours to play a DVD iso file.

Steps to do so
1. Install libraries the support Decrypting DVDs (It's not bundles with Ubuntu due to some legal issues concerning Digital Rights Management).
2. Mount your iso image:
2.1. Create a mounting point anywhere in your filesystem, by creating a new directory.
I did so by
>sudo mkdir /mnt/isoimage
2.2 Mount your image:
>sudo mount -t iso9660 iso-file-name.iso /mnt/isoimage -o loop
3. Install VideoLAN as your DVD player, using Application->Add/Remove...
4. In the Open Disc option, replace the /dev/scd0 to /mnt/isoimage and you're set!