The software described in this documentation is either in Extended Support or Sustaining Support. See https://www.oracle.com/us/support/library/enterprise-linux-support-policies-069172.pdf for more information.
Oracle recommends that you upgrade the software described by this documentation as soon as possible.

2.2.37 Upgrading rhn-client-tools

The expiration date for the Oracle Linux 6 GPG key has been extended in this update. If you install the rhn-client-tools package and the installed version of the oraclelinux-release package is from a previous update, you might see a transaction error such as the following:

Transaction Check Error:
  file /etc/pki/rpm-gpg/RPM-GPG-KEY from install of
rhn-client-tools-1.0.0.1-18.0.2.el6.noarch conflicts with file from package
oraclelinux-release-6:6Server-5.0.2.x86_64 

To avoid this error, install both the oraclelinux-release and rhn-client-tools packages from this update (oraclelinux-release-6Server-6.0.2 or later and rhn-client-tools-1.0.0.1-18.0.2 or later).