i have 6.06 ubuntu..
these are the errors when trying to install the multimedia stuff using easyubuntu...
W: GPG error:
http://www.debian-multimedia.org sarge Release: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 07DC563D1F41B907
W: Duplicate sources.list entry
http://gb.archive.ubuntu.com dapper/universe Packages (/var/lib/apt/lists/gb.archive.ubuntu.com_ubuntu_dists_dapper_universe_binary-i386_Packages)
W: Duplicate sources.list entry
http://packages.freecontrib.org dapper/free Packages (/var/lib/apt/lists/packages.freecontrib.org_plf_dists_dapper_free_binary-i386_Packages)
W: Duplicate sources.list entry
http://packages.freecontrib.org dapper/non-free Packages (/var/lib/apt/lists/packages.freecontrib.org_plf_dists_dapper_non-free_binary-i386_Packages)