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"This system is not subscribed to any channels." エラーで yum update が失敗する

Solution Verified - Updated 2014-12-23T04:40:54+00:00 -

Issue

yum update が実行できません。

以下のエラーで yum update に失敗します。

This system is not subscribed to any channels. 
RHN channel support will be disabled. 
Setting up Update Process 
No Packages marked for Update

Environment

Red Hat Enterprise Linux 5
Red Hat Enterprise Linux 6
Red Hat Network (RHN) 5.2.4

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