Error message with ‘yum update, yum install’ “This system is not registered with an entitlement server. You can use subscription-manager to register.

 In centos 8


Cause:

This issue can be caused when the system has RHEL (RedHat) repositories installed (generally by mistake) or by old, bad, extra yum plugins.
 
 

Resolution:

To fix this issue follow the steps below:
 

1. In your preferred editor (vi, vim, nano, etc.) open the “subscription-manager.conf” file

sudo nano /etc/yum/pluginconf.d/subscription-manager.conf
 
 

2. Inside the “subscription-manager.conf” file change enabled to 0 and save the file

enabled=0
 
 

3. Lastly issue the “yum clean all” command

yum clean all
 
 

Check once 

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