Thank you for all your advices. I got a solution for the problem: rpm -Fvh http://mirror.centos.org/centos/4/os/i386/CentOS/RPMS/centos-release-4-0.1.i386.rpm The above command as required before "yum install apt" for a version 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 (** These are NOT official released version.) Thank you, Karanbir Singh for your posting: [Centos] End Of Life : CentOS 4 i386 ( Rc1/ Beta2/ Beta ) and CentOS 4 ia64 (Rc1/ Beta ) http://lists.caosity.org/pipermail/centos/2005-March/003047.html Regards.