Debain etch apt update java

#apt-update
......
sun-java5-doc (1.5.0-14-1etch1) を設定しています ...
This package is an installer package, it does not actually contain the
J2SDK documentation. You will need to go download one of the
archives:

jdk-1_5_0-doc.zip jdk-1_5_0-doc-ja.zip

(choose the non-update version if this is the first installation).
Please visit

http://java.sun.com/j2se/1.5.0/download.html

now and download. The file should be owned by root.root and be copied
to /tmp.

[Press RETURN to try again, 'no' + RETURN to abort]

To solve this problem open your browser. Go to http://java.sun.com/j2se/1.5.0/download.html and download jdk-1_5_0-doc.zip or jdk-1_5_0-doc-ja.zip and save in tmp. then press enter.

W: GPG error: http://www.debian-multimedia.org etch Release: The following signatures couldn't be verified because the public key is not available:

#apt-get update
.......
........
W: GPG error: http://www.debian-multimedia.org etch 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

To solve this problem

# gpg --keyserver wwwkeys.eu.pgp.net --recv-keys 1F41B907
# gpg --armor --export 1F41B907 | apt-key add -

then again execute "apt-get update".