Misleading error message "Could not read DVD. This may be because the DVD is encrypted and a DVD decryption library is not installed "

[Steven Pemberton]

Although you get this message if CSS hasn't been installed, you also get it if the DVD drive has no region code set.
The message could more usefully read:

Could not read DVD. This may be because a DVD decryption library is not installed, or the drive has no region code set.

ProblemType: Bug
DistroRelease: Ubuntu 11.10
Package: mplayer (not installed)
ProcVersionSignature: Ubuntu 3.0.0-12.20-generic 3.0.4
Uname: Linux 3.0.0-12-generic x86_64
NonfreeKernelModules: nvidia
ApportVersion: 1.23-0ubuntu4
Architecture: amd64
Date: Fri Nov 4 17:08:31 2011
InstallationMedia: Ubuntu 11.04 "Natty Narwhal" - Release amd64 (20110427.1)
ProcEnviron:
 PATH=(custom, no user)
 LANG=en_GB.UTF-8
 SHELL=/bin/bash
SourcePackage: mplayer
UpgradeStatus: Upgraded to oneiric on 2011-10-20 (14 days ago)