[Centos] A Problem : Can NOT install APT or Synaptic for v4.0

[green at r8.dion.ne.jp (Green)]

Thank you.

>if you are using i386 - upgrade to Final/Release.

This time, I chose a fresh install of Version 4.0,
available from 
CentOS-4.0-i386-bin1of4.iso 629640 KB 2005-02-27
CentOS-4.0-i386-bin2of4.iso 651234 KB 2005-02-27
CentOS-4.0-i386-bin3of4.iso 649558 KB 2005-02-27
CentOS-4.0-i386-bin4of4.iso 232380 KB 2005-02-27

A following message appeared:

# yum install apt
................
Transaction Listing:
  Install: apt.i386 0:0.5.15cnc6-1.1.centos4 - extras
Total download size: 2.1 M
Is this ok [y/N]: y
Downloading Packages:
warning: rpmts_HdrFromFdno: V3 DSA signature: NOKEY, key ID 4fe06303
public key not available for apt-0.5.15cnc6-1.1.centos4.i386.rpm

Regards.