What distro are you using, My guess would be Ubuntu maybe? I'd just go though synaptic and search for the package from there hit Mark for installation> right click then hit "update" or "install" or somthing like that can't remember exactly
However specific instructions are as follows
Beryl
https://help.ubuntu.com/community/Co...r/Beryl/Feisty
XXMS
From command line (as root try this command
sudo apt-get install xmms
audio and video codecs
From memory you will need to install the LIBDVDCSS2 package and the Win32 Codecs package these can be installed using the synaptic package manager mentioned above
Cheers
Jake