Have you followed the steps to install libdvdcss on 8.10 outlined here?
https://help.ubuntu.com/community/RestrictedFormats/PlayingDVDs
DVDs are encrypted using a closed-source process. The capability to
decrypt and play them is not installed by default in Ubuntu and must be
enabled by the user.
** Attachment added: "Dependencies.txt"
http://launchpadlibrarian.net/25263134/Dependencies.txt
** Attachment added: "ProcMaps.txt"
http://launchpadlibrarian.net/25263135/ProcMaps.txt
** Attachment added: "ProcStatus.txt"
http://launchpadlibrarian.net/25263136/ProcStatus.txt
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