Update problems

[Spirit]

Im trying to install mplayer and i get following error

The following packages have unmet dependencies:
mplayer-586: Depends: libavcodeccvs (>= 2:20050417-0.0) but it is not going to be installed
Depends: libc6 (>= 2.3.2.ds1-21) but 2.3.2.ds1-20ubuntu13 is to be installed
Depends: libfontconfig1 (>= 2.3.0) but 2.2.3-4ubuntu7 is to be installed
Depends: libpostproc0 (>= 2:20050417-0.0) but it is not going to be installed
Depends: libvorbis0a (>= 1.1.0) but 1.0.1-1 is to be installed
Depends: libxvidcore4 (>= 1:1.0.0-0.0) but it is not going to be installed
Depends: xmms (>= 1.2.10+cvs20050209) but 1.2.10-2ubuntu1 is to be installed

When i try apt-get update i gat this message

Reading package lists... Done
W: GPG error: ftp://ftp.nerim.net stable Release: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 07DC563D1F41B907
W: GPG error: ftp://ftp.nerim.net unstable Release: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 07DC563D1F41B907
W: GPG error: ftp://ftp.nerim.net testing Release: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 07DC563D1F41B907
W: You may want to run apt-get update to correct these problems

[spd106]

Hi, have you tried the authentication method found on this wiki page
http://www.ubuntulinux.org/wiki/AptAuthenticationInstructionsForHoary

Hope this helps

[Spirit]

i've tried but like i said here http://www.ubuntuforums.org/showthread.php?p=142066#post142066